01 - Preheat the oven to 350°F. Line a 9 x 5 inch loaf pan with parchment paper, allowing overhang on sides for easy removal.
02 - In a large mixing bowl, mash the bananas thoroughly until smooth. Whisk in the eggs, applesauce, maple syrup, and vanilla extract until completely combined.
03 - In a separate medium bowl, whisk together oat flour, protein powder, baking soda, baking powder, cinnamon, and salt until well incorporated.
04 - Gently fold the dry ingredients into the wet mixture using a spatula. Mix just until combined—do not overmix or the bread will become dense.
05 - Fold in chopped nuts or dark chocolate chips if desired, distributing evenly throughout the batter.
06 - Pour the batter into 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. The top should be golden brown and firm to the touch.
08 - Let the bread cool in the pan for 10 minutes. Using the parchment paper overhang, lift the loaf out and transfer to a wire rack. Cool completely before slicing for clean cuts.