Heat heavy large pot over medium-high heat. Add ground beef and cook until beef is brown, crumbling with fork about 5 minutes. Drain well, and put in separate dish. Cover and set aside.
Place cheese, onion, parsley and yogurt in small bowls.
Ladle lentil chili into bowls and let everyone top off their chili with cheese, onion, parsley and/or yogurt to their liking.