1n 4- to 5-quart Dutch oven, heat sherry and oil over medium heat. Add onions; cook until softened. Add celery, carrot and bell pepper; cook 5 minutes, stirring frequently.
Stir in remaining ingredients except garnishes. Heat to boiling; reduce heat to low. Cover; simmer 45 to 60 minutes or until chili is desired thickness. Garnish individual servings with onion, cheese and a dollop of yogurt.