diff --git a/.changeset/thick-squids-drive.md b/.changeset/thick-squids-drive.md
new file mode 100644
index 0000000000..07654da27d
--- /dev/null
+++ b/.changeset/thick-squids-drive.md
@@ -0,0 +1,31 @@
+---
+'@backstage/frontend-plugin-api': patch
+'@backstage/frontend-test-utils': patch
+---
+
+Added support for being able to override extension definitions.
+
+```tsx
+const TestCard = EntityCardBlueprint.make({
+  ...
+});
+
+TestCard.override({
+  attachTo: { id: 'something-else', input: 'overriden' },
+  config: {
+    schema: {
+      newConfig: z => z.string().optional(),
+    }
+  },
+  *factory(originalFactory, { inputs, config }){
+    const originalOutput = originalFactory();
+
+    yield coreExentsionData.reactElement(
+      <Wrapping>
+        {originalOutput.get(coreExentsionData.reactElement)}
+      </Wrapping>
+    );
+  }
+});
+
+```