01 - Preheat the oven to 350°F. Line a 9 x 5 inch loaf pan with parchment paper, ensuring the paper overhangs the sides for easy removal.
02 - In a large mixing bowl, thoroughly mash the ripe bananas with a fork until smooth. Whisk in the eggs, applesauce, maple syrup, and vanilla extract until the mixture is uniform and creamy.
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 result in a dense bread.
05 - If using, fold in chopped nuts or dark chocolate chips until evenly distributed throughout the batter.
06 - Pour the batter into the prepared loaf pan and smooth the top with a spatula for even baking.
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 - Allow the bread to cool in the pan for 10 minutes. Using the parchment paper overhang, carefully lift the loaf from the pan and transfer to a wire rack to cool completely before slicing.