Happy Birthday to Me!
I saw a similar cake on Pinterest awhile back and wanted to replicate it, but the only recipe I found was pretty wild, including diet Sprite and diet pudding mix. Since I avoid artificial sweeteners when possible, I chose to go a more straight-forward route.
Pretty simple; mix up a box of white cake mix according to package instructions. Scoop out a cup or so, dye it red, add raspberries. Divide evenly and dollop in the center of two prepared pans. Scoop out another cup or so, dye it orange, add mandarin orange bits. Divide evenly and spoon on top of the two red dollops. Repeat for yellow and green, without fruit. Help mounded batter settle by striking the side of the pan with your hand.
Repeat for blue, indigo, and purple, mixed with blueberries. Once settled evenly in pan, bake in pre-heated oven. Cool, remove from pans, frost with confetti frosting.
I want to try it with cupcakes next!
(Other Pinterest inspiration posts: here, here, and here!)