Preheat oven to 350°. Combine the cake mix, egg and butter and mix well with an electric mixer. Pat the mixture into the bottom of a lightly greased 13 by 9" baking pan. To make the filling: In a large bowl, beat the cream cheese and pumpkin until smooth. Add the eggs, vanilla, and butter and beat together. Next. add the powdered sugar, cinnamon, nutmeg, and mix well. Spread pumpkin mixture over cake batter and bake for 40 to 50 minutes. Make sure not to over bake as the center should be a little gooey. Serve with fresh whipped cream.
Variations: For a Pineapple Gooey Cake instead of the pumpkin, add a drained 20-oz can of crushed pineapple to the cream cheese filling. Proceed as directed above.
For a Banana Gooey Cake: Prepare cream cheese filling as directed, beating in 2 ripe bananas instead of the pumpkin. Proceed as directed above.
For a Peanut Butter Gooey Cake. Use a chocolate cake mix. Add 1 C creamy peanut butter to the cream cheese filling instead of the pumpkin. Proceed as directed above.