C'mon people. American with. The better half goes Provolone without, but that's not a wrong answer. Whiz isn't cheese (and is for tourists). Hot peppers can also be added but that starts to border on fancy. If you don't have ribeye and a long roll then you just have a meat sandwich.

Note to everyone: mushrooms and green peppers never go on a cheesesteak. Or anything else, unless you are out of town and getting something "Philly Style".