1. Preheat oven to 350°F (175°C) and grease a Bundt pan with butter or non-stick spray, then dust with flour.

2. In a large bowl, whisk together flour, baking powder, baking soda, salt, cinnamon, and nutmeg.

3. In another bowl, cream the butter, granulated sugar, and brown sugar until light and fluffy.

4. Add eggs one at a time, beating after each. Stir in vanilla extract.

5. Add dry ingredients in three additions, alternating with sour cream. Mix just until combined.

6. Fold in chopped apples gently to distribute evenly.

7. Pour half the batter into the Bundt pan, drizzle with caramel, then top with remaining batter.

8. Bake for 50–60 minutes, or until a toothpick comes out clean.

9. Cool in the pan for 15 minutes, then invert onto a wire rack.

10. Once cooled, pour warm caramel sauce over the top and serve.