Philadelphia Marble Brownies

1 pkg. (20.5 oz.) brownie mix (do not use mixes that include a syrup pouch)
1 pkg. (8 oz.) PHILADELPHIA Cream Cheese, softened
1/3 cup sugar
1 egg
1/2 tsp. vanilla
1/2 cup BAKER'S Semi-Sweet Chocolate Chunks

PREHEAT oven to 350°F. Prepare brownie mix as directed on package; spread into greased 13x9-inch baking pan.
BEAT cream cheese with electric mixer on medium speed until smooth. Add sugar, mixing until well blended. Add egg and vanilla; mix just until blended.
POUR cream cheese mixture over brownie batter; cut through batter with knife several times for marble effect. Sprinkle with chocolate chunks.

Source: www.kraftfoods.com
BAKE 35 to 40 minutes or until cream cheese mixture is lightly browned. Cool; cut into squares.