1Heat oven to 350°F (325°F for dark or nonstick pans). Grease or spray two 8- or 9-inch round cake pans. In small bowl, toss 1/2 cup of the chocolate chips with 1 tablespoon of the cake mix. In large bowl, beat remaining cake mix, the water, oil, egg whites and drink mix with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Stir in the 1/2 cup chocolate chips. Pour into pans.
2Bake and cool as directed on box for 8- or 9-inch rounds.
3In small bowl, stir 1 cup of the frosting with 10 to 12 drops green food color. Stir 10 to 12 drops red food color into remaining frosting. Frost sides of cakes with green frosting; press green jelly beans into frosting. Frost tops of cakes with red frosting; press remaining 2 tablespoons chocolate chips into frosting for seeds. If desired, cut cakes crosswise in half and arrange "slices" randomly on tray. To serve, cut into wedges. Store loosely covered.