Here's the recipe:
- White cake recipe or box cake mix
- Red, yellow orange, green, blue and purple gel coloring. ( i know, I'm missing purple. I divided in 5 instead of 6.)
- Favorite buttercream recipe.
Preheat oven to 350 degrees. grease and flour 9 inch pans. (I only have two)
Mix cake mix according to directions. Measure batter into six separate bowls. I weighed them equally. Mix each color and bake. Make sure to check the oven earlier than directed as each pan has less batter. Once pans are out of oven let cool for a few minutes on cooling rack, then wrap each cake in saran wrap and refrigerate.
Start with purple on the bottom, then blue, green, orange, yellow then red. For each layer, frost then refrigerate a few minutes before adding the next layer as the cake gets pretty heavy and you don't want the buttercream to ooze out of the sides (ooze is a very technical word).
Complete frosting and enjoy!