Bright broccoli florets make this creamy soup eye-appealing and extra delicious.
In large saucepan, combine broth, cream of mushroom soup, onion, celery and salt and pepper. Bring to a boil, reduce heat, cover and simmer for 20 minutes.
Add milk and bring to a boil.
In a small bowl, mix cornstarch and water until cornstarch is completely dissolved. Gradually add mixture to soup, stirring constantly. Simmer for 5 minutes and then add broccoli and cheeses, mixing until melted.