A few years ago, I learned a Weight Watcher recipe that uses cake mix and pumpkin. The taste of the pumpkin cooks out but you get the added benefit that pumpkin is a vegetable making the recipe healthier for you.
I recently ran across this recipe for pumpkin brownies. I used a low-fat brownie mix with a can of pumpkin. I think they turned out pretty good. Plus, they had 78g. less of fat. They were thick and chewy. I threw mine in the fridge to prevent mold (an issue with using pumpkin) and they lasted over a week and half that way.
Pumpkin Brownies from Interest
1 box of brownie mix
1 can of pumpkin
Mix ingredients and pour into a 9 x 9 baking dish. Cook for 45 minutes at 350 degrees.