Macaroni and beef casserole

Cook 1 cup of raw macaroni,drain
Saute 1/2 cup chopped celery and 1 cup chopped onion until soft.
Mix in 1 tbs flour then stir in 1 cup of skim milk.Let boil and thicken,remove from heat.
Add 1 10 oz can of tomato soup,1 3/4 cups sliced cooked carrots,1 cup of cooked peas and 2 cups chopped cooked roast beef.
Stir in macaroni.
Put into a 2 quart casserole dish.
Do not cover!
Bake at 350 F for 30 minutes.
Sprinkle top with cheese and bake 5 minutes longer.
Makes 6 1/2 cups