1. In a mixing bowl, beat the cream cheese and butter until fluffy. Gradually add sugars and vanilla; beat just until combined. Stir in chocolate chips. Cover and refrigerate for 2 hours. Place cream cheese mixture on a large piece of plastic wrap; shape into a ball. Refrigerate for at least 1 hour. Just before serving, roll cheese ball in pecans. Serve with graham crackers. Yield: 1 cheese ball (about 2 cups).