In 12-inch nonstick skillet, cook beef and onion over medium-high heat 6 to 8 minutes, stirring frequently, until beef is thoroughly cooked. Add flour; cook and stir 1 minute. Stir in beer, broth, Worcestershire sauce and mustard. Heat to boiling. Reduce heat to medium; simmer 5 to 10 minutes, stirring occasionally, until sauce is thickened. Remove from heat; stir in 1 cup of the cheese. Crumble 4 of the bacon slices; stir into beef mixture.