Then, in a large mixing bowl whisk together: egg, egg whites, cinnamon, almond milk, stevia, vanilla extract, maple syrup and protein powder.
Add the cubed bread pieces into the mixing bowl with the wet ingredients and toss around until each piece of bread is well coated. Mix in diced strawberries and blueberries.
Dump bread and fruit mixture into your greased baking tray doing your best to evenly distribute the fruit pieces.
Bake for 30 minutes or until fruit has wilted and bread is toasted. While the french toast casserole is baking, use a hand mixer to beat together frosting ingredients.
Then, drizzle it over the baked casserole and let it soak into the bread.