Preheat oven to 350F. Grease and Flour either a rectangle 8 1/2 x 11 or 9 x 13 baking dish. (Do not use a smaller size or it will not bake as well)
In large bowl, mix together Cake Mix, melted Butter and beaten Eggs until it's a stiff batter.
Spoon out and spread in prepared Baking Dish.
In large bowl, mix together the softened Cream Cheese, Eggs and all but 1 Tablespoon of the Powdered Sugar. (Add Powdered Sugar 1 cup at time until well blended.)
Spread over bottom layer.
Bake in preheated oven for 30 - 40 minutes until lightly golden brown and started to slightly crack on top.
Remove from oven and let cool for at least 20 minutes.
Sift remaining 1 Tablespoon of Powdered Sugar over top of cake.
Can be kept covered up to 5 days at room temperature or refrigerated. Serve at room temperature or warm.