Triple Layer Peanut Butter Brownies

1 pkg. (19 to 21 oz.) brownie mix(13x9-inch pan size)
1 cup cold milk
1 pkg. (3.4 oz.) JELL-O Vanilla Flavor Instant Pudding
1 cup creamy peanut butter
1/2 cup powdered sugar
1-1/2 cups COOL WHIP Whipped Topping (Do not thaw.)
3 squares BAKER'S Semi-Sweet Chocolate
1/2 cup PLANTERS Dry Roasted Peanuts, coarsely chopped

PREPARE and bake brownies in 13x9-inch pan as directed on package; cool. Meanwhile, beat milk and pudding mix with whisk 2 min. Add peanut butter and sugar; mix well. Refrigerate until brownies are completely cooled.

SPREAD pudding mixture over brownies.

MICROWAVE COOL WHIP and chocolate on HIGH 1 min., stirring every 30 sec. Spread over pudding; sprinkle with nuts. Refrigerate 1 hour.