Pre-heat oven to 300°F.
Spray a 9 × 13-inch dish with cooking spray.
In a medium bowl, mix cake mix, melted butter and one egg to a soft dough.
Press into the bottom of the pan.
In a medium bowl, mix powdered sugar, softened cream cheese and remaining two eggs until smooth; about 1 - 2 minutes.
Pour on top of crust.
Place in oven and bake for 40 - 50 minutes until top is golden brown.