This is a favorite in our family although it doesn't have cracker crumbs on top.
Preheat oven to 350 degrees.
Cook elbow macaroni as package directs. Drain and rinse with cold water
Lightly grease a 9x13 inch glass dish.
Grate one pound of extra sharp cheese. Cover bottom of dish with a layer of macaroni, then grated cheese, and season with salt, pepper, and dried mustard. Repeat. Pour milk equally over the top layer until it comes about half way up the side of the dish.
Bake for about one hour or until golden brown and bubbly. Yum!!
Lois