Bust Your Diet Cake

I wanted to come up with a more clever name for this cake, but I just couldn't. The original title was too good! :)

Ingredients: 1 butter flavor yellow cake mix
1 egg
1 stick butter, softened to room temp

Topping:
2 eggs
1 box powdered sugar (1 lb size) - about 4 cups unsifted
1 package (8 oz size) cream cheese
1 teaspoon vanilla

Mix first 3 ingredients in bowl, blending well. Press into a 9 x 13 greased pan. Mix next 4 topping ingredients together, then spread on top of cake in the pan. Bake at 350F for 25-30 minutes.