Amazing Chocolate Peanut Butter Molten Cake

4 squares BAKER'S Semi-Sweet Baking Chocolate
1/2 cup (1 stick) butter
1 cup powdered sugar
2 whole eggs plus 2 egg yolks (I just used 3 eggs)
6 Tbsp. flour
4 oz. (1/2 of 8-oz. pkg.) PHILADELPHIA Cream Cheese, softened
3 Tbsp. peanut butter
2 Tbsp. brown sugar
1/4 tsp. vanilla
1/2 cup thawed COOL WHIP Whipped Topping
PREHEAT oven to 425°F. Grease 1-qt. souffle dish or baking dish; set aside. Microwave chocolate and butter in large microwaveable bowl on HIGH 1 to 1-1/2 min. or until chocolate is almost melted. Stir with wire whisk until chocolate is completely melted. Stir in powdered sugar. Blend in whole eggs and egg yolks. Stir in flour; set aside. Mix cream cheese, peanut butter, brown sugar and vanilla until well blended.

POUR half of the chocolate batter into prepared dish; cover with peanut butter mixture. Top with remaining chocolate batter.

BAKE 20 min. or until edge is set but center is still slightly soft. Cool slightly. Top each serving with the whipped topping just before serving. Store any leftover dessert in refrigerator. Reheat in microwave if desired.