In a large stock pot heat oil. Add tortillas, garlic, cilantro and onion. Saute for 2 to 3 minutes.
Stir in tomatoes and bring to a boil. Add cumin, chili powder, bay leaves and chicken stock. Return to a boil, reduce heat to medium and add salt and cayenne. Simmer for 30 minutes remove bay leaves and stir in chicken. Heat through and serve.