4 oz. small shell macaroni
1 (10 3/4 oz.) can condensed cream of celery soup
1/3 c. milk
1/4 c. mayonnaise
1/2 tsp. dry mustard
1 c. cheddar cheese, shredded
1 (7 oz.) can tuna, drained
1 c. potato chips, crushed

Cook macaroni according to directions; drain. In bowl, blend together soup, milk, mayonnaise and tuna. Gently fold in cooked macaroni. Turn into 1 1/2-quart casserole dish. Sprinkle potato chips on top. Bake, uncovered, at 350 degrees for 45 minutes. Makes 4 or 5 servings.