1In 10-inch skillet, cook beef and onion over medium heat 8 to 10 minutes, stirring occasionally, until beef is thoroughly cooked; drain.
2In 3- to 4-quart slow cooker, mix beef mixture and remaining ingredients except beans.
3Cover; cook on Low heat setting 8 to 10 hours.
4Stir in beans. Cover; cook on Low heat setting about 5 minutes longer or until beans are hot. Top with cheese and onions.