4 squares BAKER'S Semi-Sweet Chocolate, melted
1-1/2 cups milk, divided
2 Tbsp. sugar
2 cups ice cubes
1 cup COOL WHIP or COOL WHIP French Vanilla Whipped Topping, unthawed
1 tsp. vanilla
PLACE chocolate, 1/2 cup of the milk and the sugar in blender container; cover. Blend on high speed until well blended.
ADD remaining 1 cup milk, the ice, frozen whipped topping and vanilla; cover. Blend on high speed until smooth.