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 that has been sprayed with cooking oil (so it doesn't stick).
Bake uncovered at 350 for 45 minutes.
Makes about 4 servings.
You can also pop it into the microwave until hot.
Submitted by: Sharon Collipriest