Preheat oven to 400°F. Coat a standard-sized muffin tin with nonstick cooking spray.
Mix all wet ingredients in one bowl (eggs, banana). Mix all dry ingredients in another bowl (protein powder, fiber powder, cinnamon). Then combine and mix well.
Pour batter in prepared muffin tin cups, filling each cup ~3/4 of the way full. Once oven is preheated, place muffin tin in oven to bake for 15-20 minutes, or until muffin tops are golden brown.