In a large bowl, combine the Angel Food Cake Mix and the White Cake Mix. You only need the dry mix—no additional ingredients are required.
Lightly grease a microwave-safe ramekin or bowl with nonstick cooking spray.
Add 3 tablespoons of the cake mix and 2 tablespoons of water into the greased ramekin. Stir well until the mixture is smooth and bubbly.
Microwave the mixture on high for 45 seconds. The cake will puff up and cook quickly.
Allow the ramekin to cool slightly, as it will be hot. Use a spoon to carefully pop the cake out of the ramekin and onto a plate, or invert the ramekin to release the cake.
Top your mini shortcake with chopped fresh strawberries and a dollop of whipped topping. Enjoy your delicious, low-calorie strawberry shortcake!