Preheat the oven to 350.
Lightly grease a 9x13 baking pan.
In a medium bowl mix the cake mix, one egg and 1/2 cup of melted butter (that's one stick melted).
Stir to combine, it will be thick.
Using wet fingertips, spread the cake mix evenly over the bottom of the pan. You may have to wet your fingers several times to get it in there evenly.
In a small bowl mix the cream cheese, powdered sugar, 2 eggs and remaining 1/2 cup melted butter with a hand mixer until smooth.
Stir in the pecans.
Spread over the cake mix.
Bake 45-50 minutes, tenting your pan lightly with foil after about 35 minutes. The top will brown slightly.
Allow to cool completely in the pan before cutting slices.