Preheat oven to 350-degrees F and lightly grease an 8.5"x4.5" loaf pan, or line with parchment paper.
In a large mixing bowl, combine the almond flour, oat flour, tapioca starch, baking powder, baking soda, salt, and cinnamon.
1 ½ cup almond flour (143g), ¾ cup oat flour (85g), ¼ cup tapioca starch (30g), 1 ½ teaspoons baking powder, ½ teaspoon baking soda, ½ teaspoon fine sea salt, 1 ½ teaspoons ground cinnamon
Make a well in the center of the dry ingredients and add the eggs, applesauce, coconut sugar, and vanilla. Whisk the wet ingredients together in the center, then gently mix them into the dry ingredients until fully combined. Do not over mix. Then, fold in the chopped apples.
2 eggs, room temp, ½ cup unsweetened apple sauce, room temp, ⅔ cup coconut sugar, 1 teaspoon pure vanilla extract, 1 cup peeled and chopped apples
Pour the batter into the prepared loaf pan and evenly spread in pan. Let the batter rest in the pan for 10 minutes. This step is important to help the oat flour absorb the liquids, preventing soggy bread.
If adding the cinnamon apples to the top of the loaf, mix together the apples, coconut sugar, and cinnamon and sprinkle over the top of the batter while the batter is resting.
1 small/medium apple, peeled and chopped, 1 tablespoon coconut sugar, ½ teaspoon cinnamon
Bake for 35-45 minutes, or until a toothpick inserted in the center comes out clean. Check the bread around 30 minutes and if it's starting to brown too much, place a piece of aluminum foil, folded in half, over the bread.
Cool the bread in the pan for 5 minutes, then transfer to a cooling rack or plate to finish cooling before slicing. I usually wait about 45 minutes before slicing.