Preheat oven & spray an 8×8 baking dish generously with cooking spray. Combine brownie mix, eggs, and oil as directed on the back of the box, but do not add the water. Add ice cream and hot fudge to the brownie batter and stir to combine. Pour half of the brownie batter into the baking dish, layer with Oreos, then top with remaining batter. Bake for 40-50 minutes or as directed on the back of the box.