1Heat oven to 350°F. Spray 13x9-inch pan with baking spray with flour. In large bowl, beat cake mix, water, oil, eggs, food color and cocoa with electric mixer on low speed 30 seconds. Beat on medium speed 2 minutes. Pour into pan.
2Bake 30 to 35 minutes or until toothpick inserted near center comes out clean. Cool completely in pan on cooling rack.
3Line cookie sheets with waxed paper. Remove cake from pan and crumble into large bowl; stir in frosting. Roll mixture into 1 1/4-inch balls; place on cookie sheets.
4Melt candy melts as directed on package. Dip each cake ball into melted coating, tapping off excess and taking care not to get crumbs in coating. Return to cookie sheets. Decorate with sugar before coating sets.