Preheat oven to 350 degrees.

Spray three 9-inch cake pans with nonstick spray or butter, then lightly coat with flour. Set aside.

Prepare cake mix according to package directions.

Measure batter, then divide it into 3 equal portions in 3 separate bowls.

Add varying amounts of green food coloring to each bowl to create light, medium, and dark colored green batter.

Transfer batter to cake pans and bake until a toothpick inserted in the center comes out clean, about 10 to 12 minutes.

Remove cake pans from oven. Let cool slightly, then remove cake layers from pans and transfer to a wire rack to cool completely.

Once the cake layers have cooled completely, use the 2.5-inch cutter to cut each cake layer into 7 circles.

Cover a dark colored circle generously with frosting, then add a medium colored circle, and add more frosting. Finish with a light colored layer, topping with more frosting.

Use the flat edge of a knife to remove excess frosting from the sides of the cake.

Serve cakes immediately or store in a cool place. Enjoy!