HEAT oven to 325°F. Line 8-inch sq. pan with greased foil. Microwave 3 chocolate squares 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 pan.
BAKE 20 min. or until toothpick inserted in center comes out clean. Cool. Meanwhile, melt 2 chocolate squares 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 square; drizzle over bars.
