Step 1

Heat oven to 350ºF.

Step 2

Prepare brownie batter as directed on package; pour into 13x9-inch pan sprayed with cooking spray.

Step 3

Beat cream cheese in large bowl with mixer until creamy. Add sugar, egg and vanilla; mix well. Drop by tablespoonfuls over brownie batter; swirl gently with knife.

Step 4

Bake 35 to 40 min. or until toothpick inserted in center comes out with fudgy crumbs. (Do not overbake.) Cool completely.