Banana Cinnamon Swirl Loaf

Preheat oven to 350 degrees F. 
In a medium bowl combine flour, protein powder, baking powder, baking soda, and cinnamon and whisk together. 
In a medium bowl mash bananas. Combine eggs, sugars, sour cream, melted coconut oil and vanilla extract to mashed bananas. Stir together. Add dry ingredients to wet and combine. 
In a loaf pan with parchment paper add a layer of banana bread batter and spread evenly. 
In a small bowl make swirl and topping by combining cinnamon and sugars together.
Make icing by combining powder sugar and heavy cream together and stir. Set aside.
Sprinkle cinnamon sugar over half of the batter. Place remaining of the batter on top and spread evenly.  Sprinkle remaining cinnamon sugar topping on top of the batter. Bake for 42-45 minutes. Let cool, drizzle with icing and slice.