Preheat your oven to 350°F (175°C) and grease a loaf pan.
In a large bowl, mash the ripe bananas until smooth.
Add the eggs, honey (or maple syrup), applesauce, and Greek yogurt to the bananas and mix well.
In a separate bowl, combine the protein powder, whole wheat flour, baking soda, salt, and cinnamon.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Pour the batter into the prepared loaf pan and smooth the top.
Bake in the preheated oven for 50-60 minutes, or until a toothpick comes out clean.
Let the bread cool in the pan for 10 minutes before transferring to a wire rack.
Once cooled, slice and serve as desired.
Store any leftovers in an airtight container at room temperature for up to 3 days.