You will need a box of white cake mix, food coloring(yellow, pink, turquoise, purple, and green; I found that the neon food colors worked best), 4 one-pint canning jars, 1 can of vanilla frosting or you could make your own, and rainbow sprinkles of course!
Preheat oven to 350 degrees. Spray your jars with non-stick cooking spray. Make the cake mix as directed. Separate the batter into five bowls/containers evenly. I did about 3/4 C. roughly measured for each bowl. Add and mix in food coloring to each bowl until the color is very vibrant!
Spoon around 3-4 Tbs of purple batter into each jar. Repeat with other colors while layering them.
Place the jars in a baking pan filled with 1/4 inch of water and place in the oven.
Bake for 30-40 minutes. It is okay if the cake overflows. It's cleanable. Is that a word?
Remove the jars and let them cool completely before spooning out a small bit of your cake to
taste-test allow room for lots of icing!
Add your icing and sprinkles and voila! Delicioso:). Refrigerate them or plop on some lids and send them to your cousin at college far far away for her birthday:)
Happy Caking y'all.
Peace out girl scouts!