Place chicken stock and uncooked chicken breast in a soup pot and boil till meat is cooked.
Saute onion, garlic and celery in 1 tablespoon of olive oil, stir until onion is clear or lightly browned.
Stir in remaining ingredients. Heat to a boil.
Reduce and simmer 30 minutes to 1 hour, stirring occasionally.
Serve topped with fresh chopped tomatoes, sour cream and tortilla chips.
TO MAKE CREAMY WHITE CHICKEN CHILI:
Add: 12oz of sour cream and 4 cups of shredded Monterey Jack cheese. HINT: add sour cream and cheese when soup is NOT boiling, otherwise it will curdle.