Sunny Day Rainbow Cake
2 boxes white cake mix
24 oz of clear Sprite Zero
gel food coloring
Mix the cake mix with the soda according to regular instructions on box. It will be lumpy afterward.
Measure into separate bowls.
Stir color into each bowl with its own spoon. For the first color into the pan, measure out 2/3 to 3/4 of your mix (in this case about 1 c) as close to the middle as you can. Drop in your first three colors, then work on the other pan with the last three colors. So if you’re doing rainbow order, the first pan should have red, then orange, then yellow, and now the purple, blue and green go into the second pan. As a recap, this is so both layers are roughly the same size.
Bake the cake for however long the box tells you to bake it. Check it when the box says to, but usually it’ll need an extra 5 or 10 minutes or maybe more because of the density of the soda method. Just keep baking, checking back every 5 minutes or so until a toothpick to the center comes out clean. Let cool completely before moving to a wire rack.