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Preheat oven to 350ºF. For cake portion, combine cake mix, sour cream, oil, peanut butter, egg yolks, and vanilla in a large bowl; beat until well blended. In a small bowl, beat egg whites until stiff; fold into batter. Pour batter into a greased 9x13-inch baking pan. Bake 30 to 35 minutes or until a toothpick inserted into center of cake comes out clean. Allow cake to cool completely. For icing portion, combine peanut butter, butter, and vanilla in a medium bowl; beat until smooth. Add confectioners sugar and gradually add milk; beat until smooth. Ice top of cake. Serves 10-12.