Crush 16 cookies in a food processor. Add melted butter and combine . Wrap plastic wrap over bottom section of pan. Press the crumbles cookies into the bottom covered with plastic wrap - Chill for 30 minutes .
Take out of fridge and spread a layer of ice cream ,a layer of broken cookies and then more ice cream -until finished : Top with Whip Topping and Freeze for at least 3 hours.
When ready to serve -pop rings and un mold. Top with any remaining cookies.