Preheat oven to 350F degrees.
Spray a 9x13-inch baking dish with nonstick cooking spray.
In a bowl, combine 1 box yellow cake mix with ½ cup (1 stick) salted butter, melted and 2 large eggs, beaten.
Stir in 12 ounce bag semi-sweet chocolate chips.
Spread thick batter into greased baking dish.
Put in the oven and bake for about 20-25 minutes.
Allow to cool.
