Step 1

Preheat oven to 350°F. Prepare brownie batter as directed on package; spread into greased 13x9-inch baking pan.

Step 2

Beat cream cheese, sugar and vanilla in medium bowl with electric mixer on medium speed until well blended. Add egg and food colorings; mix just until blended. Pour over brownie batter; cut through batter with knife several times for marble effect.

Step 3

Bake 35 to 40 minutes or until cream cheese mixture is lightly browned. Cool in pan on wire rack. Cut into 32 squares.