Mix the applesauce, eggs, baking powder and protein powder in a small bowl.
Heat a 6-inch nonstick pan over medium heat. Spray with nonstick cooking spray and pour 2 ounces of the batter into the pan.
Cook until the edges of the cake are set, about 45 seconds, then flip. Cook for another 15 to 30 seconds; transfer to a plate. Repeat with the remaining batter.
Using the chocolate-hazelnut spread, frost in between each cake layer. Then, frost the top and the sides of the cake.
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