15 oz. pkg. Oreo cookies, crushed
1/3 c. butter, melted
3/4 half gallon ice cream, any flavor, soft
16 - 18 oz. jar hot fudge sauce
1 lg. Cool Whip

Mix Oreo crumbs and melted butter. Press in bottom of 9 x 13 inch glass dish (save 1/2 cup for topping). Spread on softened ice cream over Oreo crumbs and freeze until frozen, about 6 hours or preferably overnight. Pour over heated jar of hot fudge and cover with Cool Whip and then top with remaining Oreo crumbs. Freeze 4 hours.