Preheat oven to 350F.

Grease a 9 x 13" baking dish with cooking spray. Set aside.

In large bowl, combine cake mix, egg, and butter together.

Fold in chocolate chips.

At this point, depending on how the dough is, you might need to add 2-3 Tablespoons of water to get it to a thick, cookie-dough-like consistency.

With wet hands, spread the cookie batter evenly in the baking dish.

Bake for 20 minutes at 350.

Allow to cool completely prior to cutting.