BEAT pudding mixes and milk in large bowl with whisk 2 min. Stir in COOL WHIP.
ARRANGE 16 wafers on bottom of 8-inch square dish; cover with 1/3 of the pudding mixture. Repeat layers twice. Top with remaining wafers. Refrigerate 4 hours.
MICROWAVE chocolate in microwaveable bowl on HIGH 1 min. or until melted when stirred. Drizzle over dessert.