This Brownie Oreo Ice Cream Cake is one for the books! Fudge-y rich brownies are topped with chopped Oreo cookies that have been smothered in hot fudge and topped with Cookies & Cream Ice Cream. Add a layer of whipped topping with a few more crushed Oreos for good measure -- more is more with this dessert!
PREP: Line a 9x13-inch pan with parchment paper leaving an overhang for easy removal. Set aside. Preheat the oven according to brownie package directions.
BROWNIES Prepare the brownies according to the package directions. Bake the brownies according to package directions, but slightly under-bake the brownies by 3 minutes. The brownies should be set, but soft, so they'll cut nicely when frozen. Remove brownies from the oven and allow them to cool for about 20 minutes.
OREOS: Coarsely chop all but 3 Oreos (I cut each cookie into 4 even pieces). Gently press the chopped cookies in one even layer on top of the brownies.
HOTFUDGE: Warm the hot fudge for 30 seconds and then add dollops of the fudge all over the cookies. Working carefully and slowly (this requires some patience!) use the back of a spoon to press the hot fudge into one even layer. Freeze for 10 minutes.
ICECREAM: Let ice cream stand at room temperature for 5 minutes. Remove the pan from the freezer and scoop out large scoops of ice cream all over the hot fudge layer. Use a spatula to gently press down and smooth the ice cream into one even layer.
FREEZE: Freeze for at least 2 hours and preferably overnight.
WHIPPED TOPPING: Spread completely thawed whipped topping evenly over the ice cream and, if desired, garnish with the 3 reserved crushed up Oreos (no need to remove the filling; add full Oreos to a bag and crush with a meat mallet or wooden spoon and then sprinkle over the bars). Cover bars and return to the freezer for 30 minutes.
ENJOY: Set out bars for about 5 minutes to slightly soften before cutting into bars. Use the parchment paper overhang to remove the bars from the pan. Run a very sharp knife under hot water and then wipe off with a towel between slices. Promptly return any leftover bars, covered, to the freezer.
Note 1: If using a brownie mix or recipe, make certain it is intended for a 9x13-inch pan. We love Betty Crocker's Fudge Brownie Mix