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Heat oven to 350ºF (325ºF for dark or nonstick pans). Place paper baking cup in each of 24 regular-size muffin cups. Make and bake cake mix as directed on box for 24 cupcakes, substituting soda pop for the water and using oil and egg whites. Cool in pan 10 minutes; remove from pan to cooling rack. Cool completely, about 30 minutes