Step 1

Preheat the oven to 350°F. Grease an 8x4-inch loaf pan and line with parchment paper allowing excess to hang over the sides of the pan.

Step 2

Using the largest holes on a cheese grater, grate the apple. Or, chop the apple into small pieces. Set aside.

Step 3

In a medium bowl, whisk together flour, granulated sugar, brown sugar, cinnamon, baking soda, baking powder, salt, and nutmeg. Stir in the eggs and melted butter until fully combined. (Batter will be thick.)

Step 4

Stir the apple and nuts (if using) into the batter until evenly combined. Pour into the prepared pan and smooth out the top. Sprinkle with additional granulated sugar, if desired.

Step 5

Bake for 55 to 65 minutes or until a wooden pick inserted in the center comes out clean. Let cool in the pan on a wire rack for 10 minutes. Remove from pan and let cool for about 30 minutes more. Slice and serve warm. Any leftovers should be tightly wrapped and refrigerated for up to 5 days.