diff --git a/packages/snaps-controllers/src/interface/SnapInterfaceController.test.tsx b/packages/snaps-controllers/src/interface/SnapInterfaceController.test.tsx
index 90831604ed..5f10a1b856 100644
--- a/packages/snaps-controllers/src/interface/SnapInterfaceController.test.tsx
+++ b/packages/snaps-controllers/src/interface/SnapInterfaceController.test.tsx
@@ -101,7 +101,7 @@ describe('SnapInterfaceController', () => {
         }),
       ]);
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
@@ -143,7 +143,7 @@ describe('SnapInterfaceController', () => {
         />
       );
 
-      const interfaceId = await rootMessenger.call(
+      const interfaceId = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
@@ -192,7 +192,7 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
@@ -234,7 +234,7 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
@@ -310,7 +310,7 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
@@ -387,7 +387,7 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
@@ -438,7 +438,7 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
@@ -473,7 +473,7 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
@@ -513,14 +513,14 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           element,
           { foo: 'a'.repeat(5_000_000) },
         ),
-      ).rejects.toThrow('A Snap interface context may not be larger than 5 MB');
+      ).toThrow('A Snap interface context may not be larger than 5 MB');
     });
 
     it('throws if a link is on the phishing list', async () => {
@@ -548,13 +548,13 @@ describe('SnapInterfaceController', () => {
         }),
       ]);
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           components,
         ),
-      ).rejects.toThrow('Invalid URL: The specified URL is not allowed.');
+      ).toThrow('Invalid URL: The specified URL is not allowed.');
 
       expect(rootMessenger.call).toHaveBeenNthCalledWith(
         2,
@@ -588,13 +588,13 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           element,
         ),
-      ).rejects.toThrow('Invalid URL: The specified URL is not allowed.');
+      ).toThrow('Invalid URL: The specified URL is not allowed.');
 
       expect(rootMessenger.call).toHaveBeenNthCalledWith(
         2,
@@ -628,15 +628,13 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           element,
         ),
-      ).rejects.toThrow(
-        'Invalid URL: The Snap being navigated to is not installed.',
-      );
+      ).toThrow('Invalid URL: The Snap being navigated to is not installed.');
 
       expect(rootMessenger.call).toHaveBeenNthCalledWith(
         2,
@@ -686,13 +684,13 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           element,
         ),
-      ).rejects.toThrow(
+      ).toThrow(
         'Could not find account for address: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp:7S3P4HxJpyyigGzodYwHtCxZyUQe9JiBMHyRWXArAaKv',
       );
 
@@ -719,13 +717,13 @@ describe('SnapInterfaceController', () => {
 
       const components = panel([image(`<svg />`)]);
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           components,
         ),
-      ).rejects.toThrow('A Snap UI may not be larger than 10 MB.');
+      ).toThrow('A Snap UI may not be larger than 10 MB.');
     });
 
     it('throws if JSX UI content is too large', async () => {
@@ -748,13 +746,13 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           element,
         ),
-      ).rejects.toThrow('A Snap UI may not be larger than 10 MB.');
+      ).toThrow('A Snap UI may not be larger than 10 MB.');
     });
 
     it('throws if text content is too large', async () => {
@@ -771,13 +769,13 @@ describe('SnapInterfaceController', () => {
 
       const components = panel([text('[foo](https://foo.bar)'.repeat(2500))]);
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           components,
         ),
-      ).rejects.toThrow('The text in a Snap UI may not be larger than 50 kB.');
+      ).toThrow('The text in a Snap UI may not be larger than 50 kB.');
     });
   });
 
@@ -797,7 +795,7 @@ describe('SnapInterfaceController', () => {
         children: [input({ name: 'bar' })],
       });
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
@@ -827,7 +825,7 @@ describe('SnapInterfaceController', () => {
         children: [input({ name: 'bar' })],
       });
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
@@ -883,13 +881,13 @@ describe('SnapInterfaceController', () => {
         children: [input({ name: 'baz' })],
       });
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
       );
 
-      await rootMessenger.call(
+      rootMessenger.call(
         'SnapInterfaceController:updateInterface',
         MOCK_SNAP_ID,
         id,
@@ -932,13 +930,13 @@ describe('SnapInterfaceController', () => {
         </Form>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
       );
 
-      await rootMessenger.call(
+      rootMessenger.call(
         'SnapInterfaceController:updateInterface',
         MOCK_SNAP_ID,
         id,
@@ -977,7 +975,7 @@ describe('SnapInterfaceController', () => {
 
       const context = { foo: 'bar' };
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
@@ -986,7 +984,7 @@ describe('SnapInterfaceController', () => {
 
       const newContext = { foo: 'baz' };
 
-      await rootMessenger.call(
+      rootMessenger.call(
         'SnapInterfaceController:updateInterface',
         MOCK_SNAP_ID,
         id,
@@ -1031,14 +1029,14 @@ describe('SnapInterfaceController', () => {
 
       const context = { foo: 'bar' };
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
         context,
       );
 
-      await rootMessenger.call(
+      rootMessenger.call(
         'SnapInterfaceController:updateInterface',
         MOCK_SNAP_ID,
         id,
@@ -1090,20 +1088,20 @@ describe('SnapInterfaceController', () => {
         }),
       ]);
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           MOCK_SNAP_ID,
           id,
           newContent,
         ),
-      ).rejects.toThrow('Invalid URL: The specified URL is not allowed.');
+      ).toThrow('Invalid URL: The specified URL is not allowed.');
 
       expect(rootMessenger.call).toHaveBeenNthCalledWith(
         3,
@@ -1146,20 +1144,20 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           MOCK_SNAP_ID,
           id,
           newElement,
         ),
-      ).rejects.toThrow('Invalid URL: The specified URL is not allowed.');
+      ).toThrow('Invalid URL: The specified URL is not allowed.');
 
       expect(rootMessenger.call).toHaveBeenNthCalledWith(
         3,
@@ -1190,20 +1188,20 @@ describe('SnapInterfaceController', () => {
 
       const newContent = panel([image('<svg />')]);
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           MOCK_SNAP_ID,
           id,
           newContent,
         ),
-      ).rejects.toThrow('A Snap UI may not be larger than 10 MB.');
+      ).toThrow('A Snap UI may not be larger than 10 MB.');
     });
 
     it('throws if JSX UI content is too large', async () => {
@@ -1235,20 +1233,20 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           MOCK_SNAP_ID,
           id,
           newElement,
         ),
-      ).rejects.toThrow('A Snap UI may not be larger than 10 MB.');
+      ).toThrow('A Snap UI may not be larger than 10 MB.');
     });
 
     it('throws if text content is too large', async () => {
@@ -1268,20 +1266,20 @@ describe('SnapInterfaceController', () => {
 
       const newContent = panel([text('[foo](https://foo.bar)'.repeat(2500))]);
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         components,
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           MOCK_SNAP_ID,
           id,
           newContent,
         ),
-      ).rejects.toThrow('The text in a Snap UI may not be larger than 50 kB.');
+      ).toThrow('The text in a Snap UI may not be larger than 50 kB.');
     });
 
     it('throws if the interface does not exist', async () => {
@@ -1296,14 +1294,14 @@ describe('SnapInterfaceController', () => {
 
       const content = form({ name: 'foo', children: [input({ name: 'bar' })] });
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           MOCK_SNAP_ID,
           'foo',
           content,
         ),
-      ).rejects.toThrow("Interface with id 'foo' not found.");
+      ).toThrow("Interface with id 'foo' not found.");
     });
 
     it('throws if the interface is updated by another snap', async () => {
@@ -1323,20 +1321,20 @@ describe('SnapInterfaceController', () => {
         children: [input({ name: 'baz' })],
       });
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         content,
       );
 
-      await expect(
+      expect(() =>
         rootMessenger.call(
           'SnapInterfaceController:updateInterface',
           'foo' as SnapId,
           id,
           newContent,
         ),
-      ).rejects.toThrow('Interface not created by foo.');
+      ).toThrow('Interface not created by foo.');
     });
 
     it('can select an account owned by the snap', async () => {
@@ -1397,13 +1395,13 @@ describe('SnapInterfaceController', () => {
         </Box>
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         element,
       );
 
-      await rootMessenger.call(
+      rootMessenger.call(
         'SnapInterfaceController:updateInterface',
         MOCK_SNAP_ID,
         id,
@@ -1443,7 +1441,7 @@ describe('SnapInterfaceController', () => {
 
       const newState = { foo: { bar: 'baz' } };
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         content,
@@ -1493,7 +1491,7 @@ describe('SnapInterfaceController', () => {
         },
       };
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         content,
@@ -1528,7 +1526,7 @@ describe('SnapInterfaceController', () => {
 
       const content = form({ name: 'foo', children: [input({ name: 'bar' })] });
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         content,
@@ -1569,7 +1567,7 @@ describe('SnapInterfaceController', () => {
         approvalControllerMock.acceptRequest.bind(approvalControllerMock),
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         <Box>
@@ -1648,7 +1646,7 @@ describe('SnapInterfaceController', () => {
         approvalControllerMock.acceptRequest.bind(approvalControllerMock),
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         <Box>
@@ -1693,7 +1691,7 @@ describe('SnapInterfaceController', () => {
         approvalControllerMock.acceptRequest.bind(approvalControllerMock),
       );
 
-      const id = await rootMessenger.call(
+      const id = rootMessenger.call(
         'SnapInterfaceController:createInterface',
         MOCK_SNAP_ID,
         <Box>
diff --git a/packages/snaps-controllers/src/interface/SnapInterfaceController.ts b/packages/snaps-controllers/src/interface/SnapInterfaceController.ts
index 2a29d8788e..81a1378ba0 100644
--- a/packages/snaps-controllers/src/interface/SnapInterfaceController.ts
+++ b/packages/snaps-controllers/src/interface/SnapInterfaceController.ts
@@ -277,14 +277,14 @@ export class SnapInterfaceController extends BaseController<
    * @param contentType - The type of content.
    * @returns The newly interface id.
    */
-  async createInterface(
+  createInterface(
     snapId: SnapId,
     content: ComponentOrElement,
     context?: InterfaceContext,
     contentType?: ContentType,
   ) {
     const element = getJsxInterface(content);
-    await this.#validateContent(element);
+    this.#validateContent(element);
     validateInterfaceContext(context);
 
     const id = nanoid();
@@ -333,7 +333,7 @@ export class SnapInterfaceController extends BaseController<
    * @param content - The new content.
    * @param context - An optional interface context object.
    */
-  async updateInterface(
+  updateInterface(
     snapId: SnapId,
     id: string,
     content: ComponentOrElement,
@@ -341,7 +341,7 @@ export class SnapInterfaceController extends BaseController<
   ) {
     this.#validateArgs(snapId, id);
     const element = getJsxInterface(content);
-    await this.#validateContent(element);
+    this.#validateContent(element);
     validateInterfaceContext(context);
 
     const oldState = this.state.interfaces[id].state;
@@ -543,7 +543,7 @@ export class SnapInterfaceController extends BaseController<
    *
    * @param element - The JSX element to verify.
    */
-  async #validateContent(element: JSXElement) {
+  #validateContent(element: JSXElement) {
     // We assume the validity of this JSON to be validated by the caller.
     // E.g., in the RPC method implementation.
     const size = getJsonSizeUnsafe(element);
diff --git a/packages/snaps-rpc-methods/src/permitted/createInterface.ts b/packages/snaps-rpc-methods/src/permitted/createInterface.ts
index 1dd983036f..bd3b6ade0c 100644
--- a/packages/snaps-rpc-methods/src/permitted/createInterface.ts
+++ b/packages/snaps-rpc-methods/src/permitted/createInterface.ts
@@ -32,7 +32,7 @@ export type CreateInterfaceMethodHooks = {
     ui: ComponentOrElement,
     context?: InterfaceContext,
     contentType?: ContentType,
-  ) => Promise<string>;
+  ) => string;
 };
 
 export const createInterfaceHandler: PermittedHandlerExport<
@@ -67,13 +67,13 @@ export type CreateInterfaceParameters = InferMatching<
  * @param hooks.createInterface - The function to create the interface.
  * @returns Nothing.
  */
-async function getCreateInterfaceImplementation(
+function getCreateInterfaceImplementation(
   req: JsonRpcRequest<CreateInterfaceParameters>,
   res: PendingJsonRpcResponse<CreateInterfaceResult>,
   _next: unknown,
   end: JsonRpcEngineEndCallback,
   { createInterface }: CreateInterfaceMethodHooks,
-): Promise<void> {
+): void {
   const { params } = req;
 
   try {
@@ -81,7 +81,7 @@ async function getCreateInterfaceImplementation(
 
     const { ui, context } = validatedParams;
 
-    res.result = await createInterface(ui, context);
+    res.result = createInterface(ui, context);
   } catch (error) {
     return end(error);
   }
diff --git a/packages/snaps-rpc-methods/src/permitted/updateInterface.ts b/packages/snaps-rpc-methods/src/permitted/updateInterface.ts
index b79312f93e..43480a97af 100644
--- a/packages/snaps-rpc-methods/src/permitted/updateInterface.ts
+++ b/packages/snaps-rpc-methods/src/permitted/updateInterface.ts
@@ -38,7 +38,7 @@ export type UpdateInterfaceMethodHooks = {
     id: string,
     ui: ComponentOrElement,
     context?: InterfaceContext,
-  ) => Promise<void>;
+  ) => void;
 };
 
 export const updateInterfaceHandler: PermittedHandlerExport<
@@ -74,13 +74,13 @@ export type UpdateInterfaceParameters = InferMatching<
  * @param hooks.updateInterface - The function to update the interface.
  * @returns Nothing.
  */
-async function getUpdateInterfaceImplementation(
+function getUpdateInterfaceImplementation(
   req: JsonRpcRequest<UpdateInterfaceParameters>,
   res: PendingJsonRpcResponse<UpdateInterfaceResult>,
   _next: unknown,
   end: JsonRpcEngineEndCallback,
   { updateInterface }: UpdateInterfaceMethodHooks,
-): Promise<void> {
+): void {
   const { params } = req;
 
   try {
@@ -88,7 +88,7 @@ async function getUpdateInterfaceImplementation(
 
     const { id, ui, context } = validatedParams;
 
-    await updateInterface(id, ui, context);
+    updateInterface(id, ui, context);
     res.result = null;
   } catch (error) {
     return end(error);
diff --git a/packages/snaps-simulation/src/interface.test.tsx b/packages/snaps-simulation/src/interface.test.tsx
index 9ab14131b0..0d7e9abf62 100644
--- a/packages/snaps-simulation/src/interface.test.tsx
+++ b/packages/snaps-simulation/src/interface.test.tsx
@@ -555,7 +555,7 @@ describe('clickElement', () => {
 
   it('sends a ButtonClickEvent to the snap', async () => {
     const content = button({ value: 'foo', name: 'bar' });
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -592,7 +592,7 @@ describe('clickElement', () => {
       button({ value: 'baz', name: 'baz', buttonType: ButtonType.Submit }),
     ]);
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -657,7 +657,7 @@ describe('clickElement', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -718,7 +718,7 @@ describe('clickElement', () => {
       </Form>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -781,7 +781,7 @@ describe('clickElement', () => {
   it('throws if there is no button with the given name in the interface', async () => {
     const content = button({ value: 'foo', name: 'foo' });
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -804,7 +804,7 @@ describe('clickElement', () => {
   it('throws if the element is not a button', async () => {
     const content = input({ value: 'foo', name: 'foo' });
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -827,7 +827,7 @@ describe('clickElement', () => {
   it('unwraps errors', async () => {
     const content = button({ value: 'foo', name: 'foo' });
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -889,7 +889,7 @@ describe('typeInField', () => {
 
     const content = input('bar');
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -938,7 +938,7 @@ describe('typeInField', () => {
       />
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -980,7 +980,7 @@ describe('typeInField', () => {
   it('throws if there is no inputs in the interface', async () => {
     const content = text('bar');
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1002,7 +1002,7 @@ describe('typeInField', () => {
   it('throws if the element is not an input', async () => {
     const content = button({ value: 'foo', name: 'foo' });
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1049,7 +1049,7 @@ describe('selectInDropdown', () => {
       </Dropdown>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1096,7 +1096,7 @@ describe('selectInDropdown', () => {
       </Dropdown>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1122,7 +1122,7 @@ describe('selectInDropdown', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1144,7 +1144,7 @@ describe('selectInDropdown', () => {
   it('throws if the element is not a dropdown', async () => {
     const content = <Input name="foo" />;
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1188,7 +1188,7 @@ describe('uploadFile', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1249,7 +1249,7 @@ describe('uploadFile', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1307,7 +1307,7 @@ describe('uploadFile', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1341,7 +1341,7 @@ describe('getInterface', () => {
     const { store, runSaga } = createStore(options);
 
     const content = text('foo');
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
 
@@ -1382,7 +1382,7 @@ describe('getInterface', () => {
     ).toPromise();
 
     const content = text('foo');
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
     store.dispatch(setInterface(ui));
@@ -1409,7 +1409,7 @@ describe('getInterface', () => {
     const { store, runSaga } = createStore(options);
 
     const content = button({ value: 'foo', name: 'foo' });
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
 
@@ -1453,7 +1453,7 @@ describe('getInterface', () => {
     const { store, runSaga } = createStore(options);
 
     const content = input('foo');
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
 
@@ -1503,7 +1503,7 @@ describe('getInterface', () => {
         <Option value="option2">Option 2</Option>
       </Dropdown>
     );
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
 
@@ -1552,7 +1552,7 @@ describe('getInterface', () => {
         <FileInput name="foo" />
       </Box>
     );
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
 
@@ -1606,7 +1606,7 @@ describe('getInterface', () => {
         <Input name="foo" />
       </Box>
     );
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
     const type = DialogType.Alert;
     const ui = { type: DIALOG_APPROVAL_TYPES[type], id };
 
@@ -1622,7 +1622,7 @@ describe('getInterface', () => {
 
     const promise = result.waitForUpdate();
 
-    await interfaceController.updateInterface(
+    interfaceController.updateInterface(
       MOCK_SNAP_ID,
       id,
       <Text>Hello world!</Text>,
@@ -1661,7 +1661,7 @@ describe('selectFromRadioGroup', () => {
       </RadioGroup>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1708,7 +1708,7 @@ describe('selectFromRadioGroup', () => {
       </RadioGroup>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1734,7 +1734,7 @@ describe('selectFromRadioGroup', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1756,7 +1756,7 @@ describe('selectFromRadioGroup', () => {
   it('throws if the element is not a RadioGroup', async () => {
     const content = <Input name="foo" />;
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1943,7 +1943,7 @@ describe('selectFromSelector', () => {
       </Selector>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -1997,7 +1997,7 @@ describe('selectFromSelector', () => {
       </Selector>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -2026,7 +2026,7 @@ describe('selectFromSelector', () => {
       </Box>
     );
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -2051,7 +2051,7 @@ describe('selectFromSelector', () => {
 
     const content = <Input name="foo" />;
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -2087,7 +2087,7 @@ describe('waitForUpdate', () => {
   it('waits for the interface content to update', async () => {
     const content = <Input name="foo" />;
 
-    const interfaceId = await interfaceController.createInterface(
+    const interfaceId = interfaceController.createInterface(
       MOCK_SNAP_ID,
       content,
     );
@@ -2100,7 +2100,7 @@ describe('waitForUpdate', () => {
       content,
     );
 
-    await interfaceController.updateInterface(
+    interfaceController.updateInterface(
       MOCK_SNAP_ID,
       interfaceId,
       <Text>Hello world!</Text>,
diff --git a/packages/snaps-simulation/src/methods/hooks/interface.test.ts b/packages/snaps-simulation/src/methods/hooks/interface.test.ts
index 143c15de96..35ebd1ac3f 100644
--- a/packages/snaps-simulation/src/methods/hooks/interface.test.ts
+++ b/packages/snaps-simulation/src/methods/hooks/interface.test.ts
@@ -58,7 +58,7 @@ describe('getGetInterfaceImplementation', () => {
 
     const content = text('bar');
 
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
 
     const result = fn(MOCK_SNAP_ID, id);
 
diff --git a/packages/snaps-simulation/src/request.test.tsx b/packages/snaps-simulation/src/request.test.tsx
index 92fddaa74c..1b88865e45 100644
--- a/packages/snaps-simulation/src/request.test.tsx
+++ b/packages/snaps-simulation/src/request.test.tsx
@@ -144,7 +144,7 @@ describe('handleRequest', () => {
     });
 
     const content = text('foo');
-    const id = await interfaceController.createInterface(
+    const id = interfaceController.createInterface(
       'local:http://localhost:4242' as SnapId,
       content,
     );
@@ -362,7 +362,7 @@ describe('getInterfaceApi', () => {
     });
     const content = text('foo');
 
-    const id = await interfaceController.createInterface(MOCK_SNAP_ID, content);
+    const id = interfaceController.createInterface(MOCK_SNAP_ID, content);
 
     const getInterface = await getInterfaceApi(
       { id },
diff --git a/packages/snaps-simulation/src/request.ts b/packages/snaps-simulation/src/request.ts
index fd380ae0aa..a519784776 100644
--- a/packages/snaps-simulation/src/request.ts
+++ b/packages/snaps-simulation/src/request.ts
@@ -213,7 +213,7 @@ export async function getInterfaceFromResult(
       'The Snap returned an invalid interface.',
     );
 
-    const id = await controllerMessenger.call(
+    const id = controllerMessenger.call(
       'SnapInterfaceController:createInterface',
       snapId,
       result.content as ComponentOrElement,
diff --git a/packages/snaps-simulation/src/simulation.test.ts b/packages/snaps-simulation/src/simulation.test.ts
index 19ce17933f..162a320465 100644
--- a/packages/snaps-simulation/src/simulation.test.ts
+++ b/packages/snaps-simulation/src/simulation.test.ts
@@ -476,7 +476,7 @@ describe('getPermittedHooks', () => {
       runSaga,
     );
 
-    await createInterface(content);
+    createInterface(content);
 
     expect(controllerMessenger.call).toHaveBeenCalledWith(
       'SnapInterfaceController:createInterface',
@@ -514,9 +514,9 @@ describe('getPermittedHooks', () => {
       runSaga,
     );
 
-    const id = await createInterface(text('foo'));
+    const id = createInterface(text('foo'));
 
-    await updateInterface(id, content);
+    updateInterface(id, content);
 
     expect(controllerMessenger.call).toHaveBeenNthCalledWith(
       2,
@@ -555,7 +555,7 @@ describe('getPermittedHooks', () => {
       runSaga,
     );
 
-    const id = await createInterface(text('foo'));
+    const id = createInterface(text('foo'));
 
     const result = getInterfaceState(id);
 
@@ -596,7 +596,7 @@ describe('getPermittedHooks', () => {
       runSaga,
     );
 
-    const id = await createInterface(text('foo'), { bar: 'baz' });
+    const id = createInterface(text('foo'), { bar: 'baz' });
 
     const result = getInterfaceContext(id);
 
@@ -629,10 +629,7 @@ describe('getPermittedHooks', () => {
 
     const snapFiles = await fetchSnap(snapId, location);
 
-    const id = await snapInterfaceController.createInterface(
-      snapId,
-      text('foo'),
-    );
+    const id = snapInterfaceController.createInterface(snapId, text('foo'));
 
     const { resolveInterface } = getPermittedHooks(
       snapId,
diff --git a/packages/snaps-simulation/src/simulation.ts b/packages/snaps-simulation/src/simulation.ts
index 33d774f09d..b2e98d0eae 100644
--- a/packages/snaps-simulation/src/simulation.ts
+++ b/packages/snaps-simulation/src/simulation.ts
@@ -230,10 +230,7 @@ export type PermittedMiddlewareHooks = {
    * @param context - The context of the interface.
    * @returns The ID of the created interface.
    */
-  createInterface: (
-    content: Component,
-    context?: InterfaceContext,
-  ) => Promise<string>;
+  createInterface: (content: Component, context?: InterfaceContext) => string;
 
   /**
    * A hook that updates an interface for the Snap. This hook is bound to the
@@ -242,7 +239,7 @@ export type PermittedMiddlewareHooks = {
    * @param id - The ID of the interface to update.
    * @param content - The content of the interface.
    */
-  updateInterface: (id: string, content: Component) => Promise<void>;
+  updateInterface: (id: string, content: Component) => void;
 
   /**
    * A hook that gets the state of an interface for the Snap. This hook is bound
@@ -477,13 +474,13 @@ export function getPermittedHooks(
     getSnapFile: async (path: string, encoding: AuxiliaryFileEncoding) =>
       await getSnapFile(snapFiles.auxiliaryFiles, path, encoding),
 
-    createInterface: async (...args) =>
+    createInterface: (...args) =>
       controllerMessenger.call(
         'SnapInterfaceController:createInterface',
         snapId,
         ...args,
       ),
-    updateInterface: async (...args) =>
+    updateInterface: (...args) =>
       controllerMessenger.call(
         'SnapInterfaceController:updateInterface',
         snapId,