Rainbow cupcakes are a fun and colorful treat that kids will love. To make these cupcakes, prepare a basic vanilla cupcake batter and divide it into separate bowls. Add different food coloring to each bowl to create a rainbow of colors. Layer the different colored batters in cupcake liners and bake until golden brown. Once cooled, frost the cupcakes with rainbow-colored buttercream frosting and top with sprinkles. These vibrant and delicious cupcakes are sure to be a hit at any kids' birthday party.