A Real Philly Cheese Steak

Heat a thin layer of oil in a cast iron skillet over medium-high heat. Add the mushrooms and onion and cook, stirring occasionally, until soft. Remove the vegetables from the pan and set aside.

Add another thin layer of oil to the skillet. Add the meat to the pan, about 1/4 pound at a time. Lay the slices of meat in a single layer and cook, without turning, until no longer pink. Flip the slices over and pile on top of each other. Top with the cheese if using Provolone.

Add the vegetables back to the pan to reheat. Cover the pan and cook until the cheese melts (about 1-2 minutes).

Using a spatula, lift the meat and cheese and place on the inside edge of the bottom half of the bun. If using Cheez Whiz, slather it on top. Add the vegetables next to the meat on the bun.

Serve immediately.