Preheat the oven to 350°F (175°C). Grease a 9x5-inch loaf pan or line it with parchment paper. Melt butter (you can place it in the oven as it preheats), then set it aside to cool slightly.
Peel, core, and chop two apples into small pieces (about 1/2 inch). Thinly slice the third apple if you’d like to decorate the top of the loaf.
In a large bowl, whisk together eggs, melted butter, and vanilla extract until well combined.
In a separate bowl whisk together coconut sugar, coconut flour, baking powder, cinnamon, apple pie spice, and salt.
Add the dry ingredients to the wet ingredients and stir until a smooth batter forms. Don’t overmix.
Fold in the chopped apples.
Pour the batter into the prepared loaf pan and smooth the top. If desired, arrange the sliced apple on top for decoration and extra apple flavor.
Bake for 50 to 65 minutes, or until a toothpick inserted into the center comes out clean.
Let the bread cool in the pan on a wire rack for at least 10 minutes before removing. Once fully cooled, slice and serve. Store any leftover apple bread in an airtight container in the refrigerator for up to 5 days.