Place meat in slow cooker; top with onions and barbecue sauce. Cover with lid. Cook on LOW 8 to 10 hours (or on HIGH 4 to 5 hours). Remove meat from slow cooker; cut off and discard excess fat. Chop meat into small pieces or shred with fork. Return to slow cooker; stir to coat with sauce. Fill rolls with meat mixture and top with cheese single just before serving. Tips: Feeding a crowd? Prepare as directed, doubling all ingredients. Makes 16 servings. For added color and texture, serve with a mixed green salad tossed with your favorite Kraft Lite Dressing. Variations: Substitute the barbecue sauce: Prepare using Kraft Hickory Smoke Barbecue Sauce, Kraft Sweet Honey Barbecue Sauce or BULL'S-EYE Memphis Style Barbecue Sauce.
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