Chicken Tortilla Soup

This recipe comes from Sarah Parks. I got her permission to post her soup recipes because everyone should have these.
I love this recipe and I refuse to try another version b/c this is the best.

3 chicken breasts
3 c chicken broth
3 cloves of garlic
1 onion, chopped
3 Tbsp margarine
2 Tbsp flour
1 quart half and half
1 can cream of chicken soup
1 c salsa
1 can of corn or creamed corn
2 tsp cumin
1 packet fajita seasoning
3 Tbsp cilantro + more for garnish
Tortilla chips
Mexican style cheese

Cook chicken in the broth. Cut cooked chicken into cubes and set aside. Add water to remaining chicken broth so that it again measures 3 cups total and set broth aside.

Sauté garlic, onion, and margarine for five minutes. Add flour and stir 1 minute. Add chicken broth from above and half and half. Bring to boil over medium high heat, stirring frequently and taking care that the half and half doesn't scorch.

Turn heat to low then add soup, salsa, corn, chicken, cumin, fajita seasoning, and cilantro. Stir ingredients together and heat for 15 minutes.
Serve over tortilla chips and Mexican style cheese and garnish with more chopped cilantro.