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HEAT oven to 325°F.
LINE 8-inch square pan with foil, with ends of foil extending over sides. Spray with cooking spray. Microwave 3 oz. chocolate and cream in microwaveable bowl on HIGH 1 min. Whisk until chocolate is completely melted; cool. Add eggs, sugar and flour; mix well. Pour into prepared pan.
BAKE 20 min. or until toothpick inserted in center comes out clean. Cool. Meanwhile, melt 2 oz. chocolate as directed on package; cool.
STIR COOL WHIP into melted chocolate; spread onto dessert. Refrigerate 1 hour. Use ends of foil to lift dessert from pan. Cut into bars. Melt remaining chocolate; drizzle over bars.