Campfire Mac & Cheese

In a large pot of boiling salted water, cook pasta according to package directions. Drain.  In a large aluminum pan, combine cooked pasta, evaporated milk, melted butter, ground mustard, cayenne, and black pepper. Add cheddars and stir to combine. Cover with foil and cook over a campfire until cheese is melty, 15 minutes.  Stir mac and cheese, then top with crushed crackers and Parmesan.