Broccoli Soup

3 cups chopped broccoli (or 2 10-ounce packages frozen broccoli)1/2 cup diced celery1/2 cup chopped onion1 cup low sodium chicken broth2 cups nonfat milk2 Tbsp cornstarch1/4 tsp saltDash pepperDash ground thyme1/4 cup grated Swiss cheese
Place vegetables and broth in saucepan. Bring to boil, reduce heat, cover, and cook until vegetables are tender (about 8 minutes). Mix milk, cornstarch, salt, pepper, and thyme; add to cooked vegetables. Cook, stirring constantly, until soup is lightly thickened and mixture just begins to boil. Remove from heat. Add cheese and stir until melted.