In the same skillet, drizzle in additional olive oil and add the shaved ribeye. Season with kosher salt. Cook until all of the meat has been cooked through and there is no pink. Turn off the heat and move the pan from the hot burner.
Turn on your oven's broiler setting to high.
Lay the sliced rolls onto a sheet pan, add desired cheese, then top with meat, sauteed peppers and onions ("Wit") or just meat ("Witout"). Top with additional cheese. If using Cheez-Whiz, you'll want to portion out a few tablespoons into a microwave-safe dish and warm up to make the cheese smearable/drizzleable.
Move the sheet pan into the preheated oven and broil just until the cheese has melted and the rolls have toasted slightly, not more than a few minutes.Press to fold your cheesesteak and serve immediately!