RESERVE 24 pecan halves; chop remaining pecans. Prepare and bake brownies in 13x9-inch pan as directed on package, stirring chopped pecans into batter before pouring into pan. Cool completely.
BEAT milk and pudding mixes with whisk 2 min. Stir in COOL WHIP; spread over brownies. Top with pecan halves.
MICROWAVE chocolate in microwaveable bowl on HIGH 1 min. or until melted when stirred. Drizzle over brownies. Refrigerate 2 hours.
