Heat large saucepan over high heat until hot; add beef. Cook 3 minutes or until browned on all sides, stirring occasionally. Remove from pan. Cook potato, carrots, vinegar, thyme and pepper 3 minutes in same saucepan over medium heat. Add beef broth, water and chili sauce. Bring to a boil over medium-high heat; add beef. Reduce heat to medium-low; simmer, covered, 30 minutes or until meat is almost fork tender. Bring beef mixture to a boil over medium-high heat. Add noodles; cook, covered, 7 to 10 minutes or until noodles are tender, stirring occasionally. Add onions and peas; heat 1 minute. Serve with crackers, if desired.