Step 1

Heat oven to 350°F.

Step 2

Line 13x9-inch pan with foil, with ends of foil extending over sides. Spray with cooking spray.

Step 3

Microwave chocolate and butter in large microwaveable bowl on HIGH 2 min. or until butter is melted. Stir until chocolate is completely melted and mixture is well blended. Add 2 cups sugar; mix well. Stir in 4 eggs. Add flour; mix well. Pour into prepared pan.

Step 4

Mix cream cheese, peanut butter, remaining sugar and egg until blended; drop in spoonfuls over brownie batter. Swirl gently with knife.

Step 5

Bake 35 to 40 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool completely. Use foil handles to lift brownies from pan before cutting to serve.