Preheat the oven to 375 degrees.
In an oven-safe dish with a lid, like an enamel pot, slowly stir together the milk and the soup. Add the ham and macaroni, and stir to combine.
Bake, covered, for 40 minutes, stirring once or twice as the casserole cooks. When the macaroni is tender, remove the lid and sprinkle with the cheese. Return to the oven, uncovered, to cook for 10 more minutes, just until the cheese is melted.