INGREDIENTS
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1 package (1-layer size) yellow cake mix
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3 8 ounce packages PHILADELPHIA Cream Cheese, softened
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3/4 cup granulated sugar
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2 teaspoons vanilla, divided
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3/4 cup BREAKSTONE'S or KNUDSEN Sour Cream
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3 eggs
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2 squares BAKER'S Unsweetened Chocolate
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3 tablespoons milk
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2 tablespoons butter or margarine
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1 cup powdered sugar