1 (8 ounce) container frozen whipped topping,
1½ cups chocolate sandwich cookie crumbs
1 (9-inch) prepared chocolate crumb piecrust
Prepare pudding according to pie filling directions on package; allow to set. When pudding is ready, fold in whipped topping. Add cookie crumbs; stir. Pour mixture into prepared piecrust. Freeze pie until firm. Thaw in refrigerator before serving.