Empty cookies into a large Ziploc bag and crush till fine. In a large bowl, mix cookie crumbs and melted margarine. Spread mixture in a 9 x 13 baking dish and place in refrigerator while mixing other ingredients.
Mix both boxes of pudding with milk. This will start to thicken. Add softened ice cream and 1 cup softened whipped topping. Mix well till blended. Spread mixture over crust.
Place in refrigerator for 2 hours, remove and spread remaining whipped topping over dessert and sprinkle crushed candy bars on top. Enjoy!