Slice half of the banana and set aside.
Mash the other half of the banana with a fork and place it into a small pot with oats, protein shake and egg whites and mix well.
Cook medium-low and stir until it comes to a boil, once it boils continue cooking until thickened, about 2 - 3 minutes.
Pour into a bowl and top with remaining banana, chopped walnuts and maple syrup.
