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, whisk together the oat flour, protein powder, baking soda, baking powder, cinnamon, and salt until evenly distributed.
04 - Gently fold the dry ingredients into the wet mixture using a spatula. Mix until just combined—do not overmix as this can make the bread dense.
05 - Stir in the chopped nuts or dark chocolate chips if desired.
06 - Transfer the batter to the prepared loaf pan. Use a spatula to smooth the top evenly.
07 - Bake for 45 to 55 minutes, or until a toothpick inserted into the center comes out clean.
08 - Let the bread cool in the pan for 10 minutes. Transfer to a wire rack and allow to cool completely before slicing for best texture.