In a large pot add pasta, milk, cream, pepper, dry mustard and kosher salt. Cook on medium heat and bring to a simmer and then turn to heat to low.
Grate cheese while pasta is cooking. Measure 1 1/2 cups of grated cheese into a bowl.
Once most of the liquid is absorbed bite into a cooled piece of pasta and check for tenderness.
If it needs to cook longer add a bit more milk, unless there's plenty of liquid remaining.
About 20 minutes is what is needed to cook the pasta. More or less will depend on what type of pan you use.
Once pasta is tender stir in the grated cheese.
Sprinkle with breadcrumbs and additional cheese, if desired.