Creamy Chicken and Wild Rice Soup

3 cups cooked wild rice (Uncle Ben's Long Grain & Wild Rice Fast Cook Recipe)
3 chicken breasts cooked and diced
2-4 carrot stalks, diced
2 celery stalks, diced
1/2 onion, chopped
1/4 cup butter
1/2 cup flour
8 cups chicken broth
1 can cream of mushroom soup
Grated cheese

Saute onion and vegetables in butter, add flour and stir. Then add broth and cook until broth begins to thicken and vegetables become tender. Add 1 can cream of chicken soup, stir until dissolved. Add cooked chicken and cooked rice and simmer on low for approximately 15 minutes. Serve topped with grated cheese.