You will need the following:
1 box yellow cake mix
1 stick of butter, melted
1 (8 oz) cream cheese, softened
1 (1 lb) box powdered sugar
First, you will need to make the crust. Combine the cake mix, one egg, and the entire stick of melted butter. Mix well and press into a 13x9 inch pan that has been sprayed with non-stick cooking spray. Make sure to press the mixture up the sides of the pan, just a bit.
Next, combine the cream cheese, powdered sugar and three eggs. Mix on high speed with an electric mixer. Make sure the mixture is smooth, with no lumps. Pour on top of the crust mixture.