Preheat oven to 350 degrees F and lightly grease a 9x13-inch baking dish.
Open cake mix and measure out ½ cup and set aside for the topping.
In a large bowl, mix together remaining cake mix, oil, and 1 egg until well combined.
Press mixture into the prepared baking dish to form a crust. Bake crust for 15 minutes.
As crust is baking, prepare the filling. In a medium bowl mixing together cream cheese, sugar, and 2 eggs until smooth.
Spread filling over the prebaked crust and top with pecans and remaining ½ cup cake mix.
Bake for 15 additional minutes then allow bars to fully cool before slicing.
