Microwave chocolate and Cool Whip
in microwaveable bowl on HIGH 2 to 2-1/2 min. or until chocolate is completely melted and mixture is blended, stirring after each minute. Let stand 15 min. Spread chocolate mixture over crust. Stand wafer rectangles, top-sides facing out, around edge of pan, pressing gently into chocolate mixture to secure. Freeze 20 min. or until filling is firm.