I frosted these with a basic buttercream frosting however I divided the frosting in three parts and colored the divided frosting red, blue and yellow. I then put the frosting side by side in a piping bag and piped the frosting on the cupcakes. Don’t be afraid to load up on the frosting either because the cupcakes aren’t overly sweet. You could also leave the frosting white to be a cloud on top of the rainbow cupcakes.
I have seen these rainbow cupcakes in several places on the internet and I loved how colorful they were and had to try them. However I only saw the rainbow cupcakes with people using a cake mix so I wanted to try to make them from scratch and use my basic cupcake recipe. Let me tell you something though these suckers aren’t quick and easy to make, especially if you are OCD like me:) I had to make sure I had a perfect color layer in each liner. I am sure these would be a little faster if I just put the colors in the liners and didn’t worry about making it perfect but I can’t seem to do that! I have to admit that these cupcakes were so bright and colorful, and tasty that I am super glad I made them.