Creamy Cheese Soup

Saute 2 T. butter or oler, 2 T. celery, 2 T. carrot and 1 T. onion until tender.  Add 1/2 tsp. salt and a dash of pepper. Stir 3 T. cornstarch into 2 C. cold milk until blended. Stir slowly and constantly into vegetables.  Heat until thickened and bubbly. Add cheese and stir until melted.