Philly cheesesteak has its roots in Philadelphia, Pennsylvania. It consists of thinly sliced steak, grilled onions, and melted cheese served in a hoagie (bread roll). The kind of cheese can range from mozzarella cheese to cheddar or provolone. Sliced bell peppers can also be added into the mix for extra flavor, but they’re not necessary.
Cook the mushrooms
Add oil to a skillet over medium-high heat. Stir in the mushrooms and sauté them until browned. Season them with salt and pepper.
Sear the steak
Arrange the beef in a single layer. Sear it on each side or until browned. Remove it from the heat and set it aside with the mushrooms.
Cook the peppers
Toss in the garlic, bell peppers, and onions. Mix well and cook everything for another 4-5 minutes or until the onions soften.
Return the mushrooms and steak into the skillet. Stir well.
Sprinkle parmesan and mozzarella cheese on top. Reduce the heat to medium. Cover the skillet and cook for 2-3 minutes or until nice and melty. Remove the skillet from the heat and serve immediately. Enjoy!