I see all these cool recipes using cake mixes and I usually don't have any on hand. I found this recipe on Recipelink.com, where it is credited as being from Make Your Own Groceries. I've used it, and it does the job! There is another cake mix recipe on this site (#182515), but I thought I'd go ahead and post this one since it is slightly different (it's made with shortening, so it can be made ahead and stored in a plastic bag) and it also includes notes for variations. I'm posting a recipe for a chocolate cake mix as well.