How To make Crumly Cogwheels Tortilla Soup

1 bunch cilantro

washed well
:

(leaves only) 4 garlic cloves
1 small onion -- chopped
2 fresh serrano peppers
1 can (10-ounce) tomatoes with green chilies
3 quarts chicken stock
1 can tomato sauce (8 oz)
2 teaspoons ground cumin (cominos)

(2 to 3)
1 teaspoon salt :

(up to 2)
2 tablespoons cornstarch dissolved in a small amount of

water corn tortillas (about 20) :

cut into thin

strips vegetable oil 2 cups shredded grilled or poached chicken
:

breasts (about 2 ounces per serving) 1 1/2 cups shredded monterey jack cheese

(up to 1)
:

(about 1 ounce per serving) 2 avocados

peeled, pitted and
:

sliced
Pur