1 (18 1/4 ounce) box spice cake mix
1 (15 ounce) can 100% pumpkin puree (not pumpkin pie filling)
water, amount as specified by cake mix directions
1. Preheat oven to temperature directed on cake mix, and spray cake pan with nonstick spray.
2. Blend cake mix, pumpkin puree, and water together until smooth.
3. Pour into prepared cake pan, and bake as directed on the box. I usually bake for 20 minutes or so, until the middle is firm. Enjoy!
Source of recipe: My mother.