1 lb. penne or 1 lb. elbow macaroni
4 tbsp. unsalted butter (plus extra for buttering casserole dish)
1/3 cup all-purpose flour
4 cups Smith's milk, heated
2 cups extra-sharp cheddar cheese, shredded
2 cups American cheese, finely chopped
salt
pepper, freshly ground
hot pepper sauce
1/4 cup parmesan cheese, freshly grated