Preheat oven to 350F. Prep a 13x9 pan with non-stick spray.
Cake- In the bowl of your electric mixer place you butter, egg, and cake mix. Mix just until crumbly and butter breaks up in mix. Pat this down into your pan.
Topping- In your mixer bowl you've cleaned mix butter, eggs, powdered sugar and cream cheese until very creamy, about 3 minutes. Pour evenly over cake then spread gently to the edges with the back of a spoon. Bake at 350 for 20 minutes, Take out the cake and sprinkle alittle powdered sugar all over the top, then place back in the oven for another 20 or 30 more minutes until golden brown. I then sprinkle alittle more powdered sugar all over when it comes out. Serve warm!