So for Valentine's Day I want to make my hubby and I a sweet treat that won't break the calorie bank. I've read up on taking a cake mix and replacing the eggs, oil, and everything else but the mix with either a can of diet soda, or a 15 oz can of pumpkin. I've heard they both work great but I can't pick between the two. Though the pumpkin would obviously provide more nutrition, I'm afraid it will be too dense.
For those of you who have experience with either of these methods, what would you recommend?