From Jessica Seinfeld's cookbook (yellow cake pg. 186)
1 box yellow cake mix (18 oz) - I used strawberry and it was really good!
1 cup canned pumpkin
1/4 cup water
2 tbls vegetable oil
6 ounces nonfat lemon, banana or vanilla yogurt (little less than a cup) -any kind really
Preheat oven to 350, coat 9X13 baking pan with spray/flour.
In a large bowl combine all ingredients. Beat until smooth, 1-2 minutes. Pour the batter into cake pan. Bake until a toothpick comes out clean. About 20 min. -I think I baked mine a lot longer, just keep an eye on it I guess!
We made this for Holly's birthday. It was sooooo moist! The best birthday cake I've ever had. I'll never go back!