Cookies and Cream Pie

Crush Oreo cookies into small pieces. In a large bowl, mix crushed Oreos with both tubs of whipped topping. *If using cookies and cream ice cream as well, put ice cream into Oreo pie crust, filling only half of the pie crust. Put whipped topping/Oreo mixture in the pie crust. (*on top of the ice cream). Cover. *If you used ice cream, place it in the freezer for at least 30 minutes before eating. If you did not use ice cream, place in the fridge for at least two hours.