I suspect you could. I've never tried it, but it's the same concept. If you do try, line a 8x8" baking dish with parchment paper, sprayed well with vegetable spray. Spread the chocolate brownie (I mean cookie) mixture into the pan and bake for 25-30 minutes at 350°. For fudgier, chewier brownies, cook for less time. For more cake-like consistency, bake longer.