4 oz. sm. shell macaroni
1 (10 3/4 oz.) can cream of celery soup
1/3 c. milk
1/4 c. salad dressing or mayonnaise
1/2 tsp. dry mustard
1 c. shredded American cheese
1 (6 1/2 or 7 oz.) can tuna, drained and flaked
1/4 c. fine dry bread crumbs
1 tbsp. melted butter
1/2 tsp. paprika

Cook macaroni according to package directions; drain. In large bowl, blend together soup, milk, mayonnaise and mustard. Stir in cheese and tuna. Gently fold in cooked macaroni. Turn into a 1 1/2 quart casserole. Combine crumbs, melted butter and paprika; sprinkle on top of casserole. Bake uncovered at 350 degrees until heated through, 45 to 50 minutes.