Preheat oven to 375°F.

Cook macaroni according to package directions and drain; toss with butter; season with salt and black pepper to taste.

Whisk together the eggs and milk and set aside.

Spray an oblong casserole dish with nonstick spray.

Brown ham cubes lightly in a nonstick skillet.

Place half the cooked buttered noodles in the casserole and top with all the browned ham cubes.

Cover ham with half the cheese, then top with the rest of the noodles, the rest of the cheese, then the egg custard mixture.

Bake for about 45 minutes or until lightly browned on top.