1In the deep pan heat the oil and add garlic and onions until soft.
2Add all the ingredients.
3Bring to low boil, then reduce heat and simmer 20 minutes.
4Cut tortillas into 1/4-inch strips and fry in oil or spray with oil and bake at 140 degrees.
5 Sprinkle with salt if desired.
6Thoroughly mix flour and water, then whisk into soup. Bring to a low boil, then simmer 5 minutes.
7Add chicken and simmer 5 minutes.
8Stir in sour cream and cheese.
9After serving soup, pile tortilla strips on top of the soup.
10Garnish with freshly chopped cilantro.