Ham Casserole

1 1/2 cups ham cubes

1 cup grated Cheddar cheese

1/2 cup milk

1 can cream of mushroom soup

2 cups cooked macaroni

2 tablespoons butter

2 tablespoons chopped onion

Cook ham and onions in butter. Add soup, milk and cheese; cook until cheese melts. Add remaining ingredients. Bake in greased 2-quart casserole at 350F for 30 minutes.