Prepare the Steak:
If you didn’t buy pre-sliced steak, slice the ribeye against the grain as thinly as possible. Thin slices will cook quickly and give you that classic cheesesteak texture.
Cook the Veggies:
Heat a large skillet over medium-high heat. Add the avocado oil (or butter), and sauté the onion, peppers, and mushrooms until softened and slightly caramelized—about 5-7 minutes.
Add the garlic and cook for an additional 30 seconds until fragrant.
Cook the Steak:
Push the vegetables to one side of the skillet. Add the sliced steak to the other side and season with salt and pepper. Let it sear for about 2-3 minutes until browned, then flip the pieces to sear the other side.
Once the steak is cooked through but still tender (it’ll cook fast due to its thinness), mix the steak with the veggies in the skillet.
Add the Flavor:
Pour in the beef broth, Worcestershire sauce, and Dijon mustard (if using). Stir to combine and let it simmer for a couple of minutes to reduce and meld the flavors. Taste and adjust seasoning with salt and pepper as needed.
Melt the Cheese:
Sprinkle the shredded provolone cheese over the steak and veggie mixture. Cover the skillet with a lid and let the cheese melt for about 2-3 minutes until bubbly and gooey.
Serve:
Once the cheese has melted and everything is hot, remove from heat. Garnish with fresh parsley for a pop of color (optional)