Take a white cake mix, make according to directions. Divide into bowls and use neon food coloring. Add a spoon of each color in the cupcake batter. Take a toothpick or a knife to swirl the colors together.
How to make a (really simple) Rainbow Cake that tastes DELICIOUS! Thousands of people have made this recipe successfully - even kids and first time bakers! Rainbow Cake is the perfect cake for a childrens birthday party or pride event!