Prepare brownie mix as directed on package. Pour into Pam sprayed 13 x 9 inch baking pan. Beat cream cheese with electric mixer on medium speed until smooth. Add sugar, mixing until blended. Add egg and vanilla; mix just until blended. Pour cream cheese mixture over brownie mixture; cut through batter with knife several times for marbled effect. Bake at 350 degrees for 35 to 40 minutes or until cream cheese mixture is lightly browned. Cool; cut into squares.
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