Gooey Butters

These are so good. Make sure you have someone to share with so you don't eat the entire pan!

1 yellow cake mix (other flavors can be used)
1/2 cup butter or margarine
4 eggs
8 oz cream cheese
1 tablespoon vanilla
1 lb powdered sugar (1 box or 3 3/4 cups)
Reserve 2 to 3 tablespoons of powdered sugar

Beat cake mix, melted butter and 2 eggs (batter will be stiff). Spread in 9 x 13 pan. Beat 2 eggs, cream cheese, vanilla, and sugar until smooth. Pour over first layer. Bake at 350E for 15 minutes, sprinkle reserved powdered sugar over top, then bake 20 to 30 minutes more. Best when allowed to sit overnight.