Brownie Oreo Ice Cream Bars

package fudge brownie mix + ingredients called for (make certain the brownie mix is intended for a 9 x 13 pan!)

oreos (separated (leave 3 for topping))

container (12.8 ounces) hot fudge topping

container (48 ounces) cookies and cream ice cream

container (8 ounces) frozen whipped topping (completely thawed)

Optional: parchment paper