Heat the over to 350 degrees.
Lightly grease a 9×13 glass dish.
Prepare your sugar cookie dough according to the directions on the package. Press cookie dough into the bottom of the pan. If you use prepacked cookie dough from the refrigerated aisle this is even quicker!
In a large bowl combine the brownie mix, eggs, and oil. Stir well until combined.
Pour brownie batter over the layer of cookie dough.
If desired sprinkle with chocolate chips.
Bake for 40-45 minutes. Remove from over and allow to cool before cutting.