Preheat your oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan.

In a medium bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, and nutmeg. Set aside.

In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy, about 3-4 minutes.

Add the eggs one at a time, mixing well after each addition.

Stir in the apple cider, bourbon, and vanilla extract until combined.

Gradually add the dry ingredients to the wet ingredients, mixing just until combined. Do not overmix.

Fold in the diced apples and chopped nuts (if using).

Pour the batter into the prepared loaf pan and smooth the top.

Bake for 55-65 minutes, or until a toothpick inserted into the center comes out clean.

Let the cake cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely.