Prepare cake mix as directed on box. While cake bakes, warm sweetened condensed milk in microwave or on low heat. Immediately after taking cake out of oven, pierce the top thoroughly with meat fork. Pour milk over cake slowly so it soaks in. Cool completely. Warm Hershey chocolate fudge topping in microwave or in pan of hot water to pouring consistency. Cover cake with topping. Add Cool Whip as a frosting. Crush candy bars and sprinkle on tope. Refrigerate until serving. DELISH!