My cost for the cake portion, including eggs and butter, was about $1 for this funfetti cake. I used this butter cake recipe for the batter base.
After the batter was blended together, I used a rubber spatula to fold in 1/3 cup of rainbow sprinkles. (I bolded the "fold in" part on purpose. If you use a mixer at this point you'll break the rainbow bits up and it won't look so nice.) That's all it takes. For a batch of batter that makes 2 8-inch layers, you need about 1/3 cup of sprinkles.
The batter looks sparsely populated with rainbow bits before it is baked. During baking the sprinkles all "explode" and give much more color to the cake.
The cake could have been about 40 cents cheaper if I had subbed margarine for the butter, but I happen to really like the flavor that butter adds to a vanilla cake. So I went with the real deal. I bought the rainbow sprinkles at Win Co in the bulk section. Much less expensive to buy them from bulk bins than in small containers in the baking section.
