MICROWAVE chocolate in large microwaveable bowl on MEDIUM 45 sec. to 1 min. or until completely melted when stirred.
ADD cream cheese and vanilla; beat with electric mixer on medium speed until well blended. Add marshmallow creme; mix well. Gently stir in the whipped topping.
SPOON into serving bowl or pipe into 6 individual dessert dishes. Refrigerate several hours or until well chilled. Garnish as desired. Store in refrigerator.