01 - Preheat oven to 350°F. Line a 9 x 5 inch loaf pan with parchment paper, ensuring edges overhang for easy removal.
02 - Process rolled oats in a blender or food processor until fine flour consistency forms. Measure 2 cups after blending.
03 - Mash bananas thoroughly in a large bowl. Whisk in eggs, applesauce, maple syrup, and vanilla extract until completely smooth and uniform.
04 - In a separate medium bowl, whisk together oat flour, protein powder, baking soda, baking powder, cinnamon, and salt until well distributed.
05 - Gently fold dry ingredients into wet mixture using a spatula. Mix only until flour disappears. Do not overmix or bread becomes dense.
06 - Fold in chopped nuts or dark chocolate chips if desired, distributing evenly throughout batter.
07 - Pour batter into prepared loaf pan. Smooth top with spatula. Bake 45-55 minutes until toothpick inserted in center emerges clean.
08 - Cool in pan 10 minutes. Using parchment overhang, lift loaf onto wire rack. Cool completely before slicing into 10 even pieces.