Tuna Casserole

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8 oz. tri color rotini
2 cans cream of mushroom soup
2/3 C. milk
1/2 C. mayonnaise
1 tsp. dry mustard
2 C. diced string cheese
7 oz. tuna drained and flaked

Cook rotini according to package and drain. Mix soup, milk, mayonnaise and mustard. Stir in rotini and cheese and gently fold in tuna. Turn into a 1 1/2 qt. casserole dish that has been sprayed with cooking oil. Bake uncovered at 350 degrees for 45 minutes.