Chocolate-Peanut Butter Candy Dessert

12 OREO Cookies, crushed
2 Tbsp. butter, melted
1/2 cup peanut butter
2 cups cold milk
2 pkg. (4-serving size each) JELL-O Chocolate Instant Pudding
2 cups thawed COOL WHIP Whipped Topping, divided
2 Tbsp. hot fudge ice cream topping
1/4 cup candy-coated peanut butter pieces
MIX crushed cookies and butter; press firmly onto bottom of 8-inch square pan.
PLACE peanut butter in large bowl. Gradually add milk, stirring with wire whisk until well blended. Add dry pudding mixes. Beat 2 min. or until well blended. (Mixture will be thick.) Stir in 1 cup of the whipped topping. Spread onto prepared crust; top evenly with remaining 1 cup whipped topping.
REFRIGERATE 3 hours or until set. When ready to serve, microwave fudge topping as directed on package; drizzle over dessert. Sprinkle with candies. Store leftovers in refrigerator.