Preheat oven to 350°F. Line standard muffin pan with baking cups. In large bowl, combine cake mix, water, oil and egg whites; beat with electric mixer 2 minutes. Add lemon zest and juice; mix until well blended. Spoon into baking cups. Bake 20-22 minutes or until toothpick inserted comes out clean. Cool cupcakes in pan on cooling rack for 5-8 minutes. Remove cupcakes from pan; cool completely.
*Any of our cupcake recipes may be prepared in our Mini Tasty-Fill pans. Spray pans with vegetable pan spray, then fill each with about 1/2 cup batter. Place pans on cookie sheet and bake 14-16 minutes. Cool in pan on cooling grid for about 8 minutes; remove from pan and cool completely before filling and icing.