Directions: Prepare batter according to package directions.
In separate bowls combine 1 1/3 cup of batter with blue food coloring and mix - In second bowl again add 1 1/3 cup white cake batter with red food coloring and mix. You'll be left with remaining white batter in your original bowl.
Fill each paper lined muffin cups with about 2 tbs red batter, 2 tbsp white batter and 2 tbsp blue batter. Bake at 350 degrees for 20-24 minutes or until toothpick comes out clean.
Cool at least 30 minutes and frost with vanilla frosting; decorate with sprinkles.