Now, let’s get to the fun part – baking! Follow these steps, and you’ll have a delectable cake that’s sure to impress:

1. Preheat your oven to 350°F (175°C) and generously grease a bundt pan with butter or non-stick spray.
2. In a medium bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, and salt. Set aside.
3. In a large bowl, beat the granulated sugar, brown sugar, and butter together until creamy and fluffy, about 3-4 minutes.
4. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
5. Mix in the sour cream until well combined.
6. Gradually add the dry ingredients to the wet mixture, mixing just until combined. Be careful not to overmix.
7. Fold in the diced apples and nuts (if using) with a spatula, ensuring they are evenly distributed throughout the batter.
8. Pour the batter into the prepared bundt pan, smoothing the top with a spatula.
9. Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean. The cake should be golden brown with a slight spring to the touch.
10. Allow the cake to cool in the pan for about 15 minutes, then invert onto a wire rack to cool completely before serving.

Baking this cake is like a dance, where each step flows naturally into the next. Remember, the kitchen is your stage, and this cake is your masterpiece.