Shred cheese and let it sit at room temp.
Boil pasta until al dente, then drain.
Melt butter in saucepan, whisk in flour 1 min.
Slowly add cream and milk, whisk 3 mins.
Add seasonings and optional hot sauce.
Reduce heat, stir in cheese until smooth.
Add pasta and combine well.
(Optional) Transfer to dish, top with Ritz, bake 15 min at 325°F.
