01 - Preheat the oven to 350°F. Line a 9 x 5 inch loaf pan with parchment paper.
02 - In a large mixing bowl, mash the bananas thoroughly until smooth. Whisk in the eggs, applesauce, maple syrup, and vanilla extract until well combined.
03 - In a separate medium bowl, combine the oat flour, protein powder, baking soda, baking powder, cinnamon, and salt. Whisk to evenly distribute the leavening agents and spices.
04 - Gently fold the dry ingredients into the wet mixture using a spatula. Mix just until combined and no dry streaks remain. Do not overmix to prevent dense texture.
05 - Stir in chopped nuts or dark chocolate chips if desired.
06 - Pour the batter into the prepared loaf pan. Use a spatula to smooth the top evenly.
07 - Bake for 45–55 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
08 - Let the bread cool in the pan for 10 minutes, then carefully remove and transfer to a wire rack. Cool completely before slicing for clean cuts.