Preheat oven to 350. Spray an 8 X 8 inch baking dish with non-stick spray.
In small bowl combine (set aside) Stevia/Coconut Sugar and cinnamon.
In a large bowl whisk together: oat flour, protein powder, baking powder, salt, and stevia.
In a medium bowl whisk together & add to a large bowl: egg whites, almond milk, applesauce, yogurt, and vanilla.
Pour a shallow layer of batter into the loaf pan (about ¼ of the batter).
Sprinkle heavily with half of the cinnamon/sugar mixture.
Repeat with remaining batter & cinnamon/sugar on top. Draw a knife through the batter to marble.
Bake for 24 to 28 min. Let cool for 10 min. Cake will be dense.
