I did a search and found this recipe. I think this might be the one you are looking for...........
I follow Weight Watchers and this recipe is a hit there, I do add 2 egg whites to the cake mix and soda it does make it a tad bit better and doesnt add any extra fat or calories.
If you like pumpkin ..
1 boxed spice cake mix
add 1- 15 oz can of pumpkin (PLAIN) and 2 egg whites, 1/2 cup water and a teaspoon of pumkin pie spice. This is so good especially this time of the year. I make it in a muffin tin w/o papers.