Preheat your oven to 350°F (175°C).

Grease a bundt pan thoroughly with butter or non-stick spray.

In a mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, and cinnamon.

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

Add the eggs one at a time, mixing well after each addition, and stir in the vanilla extract.

Gradually mix the dry ingredients into the wet mixture until just combined.

Gently fold in the chopped apples and nuts (if using).

Pour the batter into the prepared bundt pan, spreading it evenly.

Bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for about 10 minutes before transferring it to a wire rack. Dust with powdered sugar after it’s completely cooled.