Preheat oven to 350°
Reserve one tablespoon of powdered sugar for decoration.
Mix cake mix, two sticks of butter, and one egg. Mixture will be thick. Press mixture into the bottom of the pan.
Mix cream cheese, two eggs, powdered sugar, and vanilla until smooth (i use the same bowl from the cake mixture). Pour over cake mixture.
Bake or 40 minutes, or until the top starts to brown and crinkle. Cream cheese mixture WILL NOT be set.
Allow to cool, and sprinkle reserved powdered sugar over the top of the cake for decoration.