Peel and cut the apples in slices. Take out the center.
Mix the oat flour, protein powder, cinnamon, baking powder and baking soda together in a bowl.
Add the egg whites, milk, vanilla extract and agave syrup. Mix till smooth.
Dip the apple slices into the batter and take them out with a fork. Place them directly into the frying pan. Flip when it starts to bubble.