01 - Preheat oven to 350°F. Line a 9 x 5 inch loaf pan with parchment paper.
02 - In a large mixing bowl, mash bananas thoroughly. Whisk in eggs, applesauce, maple syrup, and vanilla extract until smooth and well combined.
03 - In a separate medium bowl, whisk together oat flour, protein powder, baking soda, baking powder, cinnamon, and salt.
04 - Gently fold dry ingredients into wet mixture until just combined. Avoid overmixing to prevent dense texture.
05 - Stir in nuts or chocolate chips if desired.
06 - Transfer batter to prepared loaf pan and smooth top evenly.
07 - Bake for 45 to 55 minutes, or until toothpick inserted in center emerges clean.
08 - Cool in pan for 10 minutes, then transfer to wire rack to cool completely before slicing.