Dark Chocolate Mousse

Needed!
4 squares BAKER'S SELECT Bittersweet Chocolate
1 tub COOL WHIP Whipped Topping, thawed

MICROWAVE chocolate in microwaveable bowl on HIGH 1-1/2 min., stirring with whisk every 45 sec. until melted. ADD 1 cup COOL WHIP; stir until blended. Stir in remaining COOL WHIP.