Low-cal cupcakes

I got this idea from a friend. She made me some of these for my birthday with strawberry flavored cake mix.

Take any box of cake mix and mix in a 12 oz can of any kind of diet soda. Use something like Sprite or diet coke if you don't want the flavor of the cupcakes to be affected by the soda. Or you could add something like cherry coke or cherry DP to add some additional flavor. Bake like usual. Frost or not, depending on how many calories you're looking for. The texture turns out really good, and without all the fat and calories of the oil and eggs.