Mix cookie crumbs and butter. Press onto bottom and up side of 9-inch pie plate.
Beat cream cheese, peanut butter, sugar and vanilla with mixer until blended. Stir in 1-1/2 cups COOL WHIP; spoon into crust.
Freeze 4 hours or until firm. Remove from freezer 30 min. before serving. Let stand at room temperature to soften slightly. Top with remaining COOL WHIP.