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Heat oven to 350. Grease bottom only of 9 inch square pan with shortening or cooking spray.
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In a small bowl, beat filling ingredients with electric mixer on low speed until smooth. Set aside.
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Make brownie batter as directed on box.
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Spread 3/4 of brownie batter in pan.
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Spoon filling by tablespoonfuls evenly onto brownie batter.
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Spoon remaining brownie batter over filling.
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Cut through mixture with knife several times for marbled design.
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Sprinkle with chocolate chips.
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Bake 40 to 44 minutes or until toothpick inserted in brownie 1 inch from side of pan comes out clean.
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Cool completely, about 1 1/2 hours.
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For 16 brownies, cut into 4 rows by 4 rows.
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Store covered in refrigerator.