In a large bowl, mash 1 ripe or brown banana with 3 Tbsp. unsweetened almond milk. Add 2 1/2 cups of unflavoured whey protein powder, 1 1/2 cups egg whites, 2 Tbsp. ground flaxseed, 2 Tbsp. water, 1/4 cup unsweetened applesauce, 2 Tbsp. melted coconut oil, 1 tsp. vanilla extract, 3 tsp. baking powder, 1 1/2 tsp. cinnamon, and a pinch of salt. Gently fold in 1/2 cup blueberries.
Grease a muffin tin with coconut oil, and divide mixture between the 12 standard-sized cups. Bake for 15 to 20 minutes. When finished, they will be browned and should pass the toothpick test (no wet batter, only crumbs). Sprinkle with powdered stevia, and allow to cool.