Add cake mix, water, applesauce and liquid egg whites in a large bowl. Whisk together with the hand mixer until all the lumps are gone and the mix is completely combined.
Line a 12-hole cupcake pan with liners or spray with cooking spray.
Fill up each hole evenly with the cake mix then bake accoridng to package instructions, about 18 minutes. Remove from oven once a toothpick comes out clean.
Frost each cupcake with ⅛ cup of lite cool whip topping.