White Chicken Chili

1-2 pounds chicken breasts, cooked and cut up
3 cans Great White Northern beans
1 (10 oz.) can rotel tomatoes
1 T oil
1 onion, chopped
1 t oregano
12 ounces sour cream
1/2 t salt
3 cloves garlic, minced
2 t cumin
1/2 t cayenne pepper
1 (14oz) can chicken broth
1 can diced green chilles
3 cups shredded monterey jack cheese

Saute onion and garlic. Add beans, chicken broth, chilles, rotel tomatoes, and spices.  Cook on med low heat 1 hour (or in a crock pot several hours).  Just before serving, add cooked chicken, and stir in cheese and sour cream until blended.