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