Heat 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.