Preheat your waffle iron
Mix all of your dry ingredients into a large bowl.
Mix all of your wet ingredients in another bowl, including the mashed banana. Add the wet ingredients into the bowl with the dry ingredients and mix everything together until just combined.
Lightly spray your waffle iron with oil.
Pour your batter onto the center of the waffle iron and close the lid. Cook according to your waffle maker's instructions, usually 3 to 5 minutes, until steam slows down and the edges are golden.
Carefully remove the waffle and repeat with the remaining batter, re-spraying the iron between batches if needed.
Serve your protein waffles with your favorite toppings like honey or maple syrup, fresh berries, nuts, or sliced fruit.