1. Make the cake batter according to the directions on the package. Bake in a greased 9-inch cake pan. Once baked, remove from pan and cool.
2. Cut the cake in half. Arrange the cake on a serving platter, turning the halves so that the rounded sides touch. To shape the wings, cut out a 1-inch triangle from each straight side, 2-inches from the bottom.
3. Completely frost the cake with the icing. Design a mosaic pattern with M&M'S® Brand Milk Chocolate Candies for Easter, and then press them into the top of the cake.
4. To make the butterfly's antennae, unwrap and soften the STARBURST® Brand FUN SIZE® Fruit Chews for Easter in the microwave for approximately 5 seconds. Then roll the candy into thin ropes and place them at the top of the butterfly.