Start by heating a cast iron skillet over medium-high heat. Add 1 pound of ground beef and allow it to sear undisturbed for about 3–4 minutes, creating a beautiful brown crust. Once it’s nicely browned on one side, use a spatula to break it apart, continuing to cook until half the beef is crispy. Then, remove it from the skillet and set aside.

In the same skillet, melt 1 tablespoon of butter over medium heat. Add the chopped onion, bell pepper, and sliced mushrooms. Cook these vibrant vegetables undisturbed for 1–2 minutes, allowing them to get a nice golden color. Then stir and continue cooking for an additional 2–3 minutes until the veggies are softened and fragrant, creating a delightful aroma.

Return the browned beef to the skillet with the veggies. In a separate bowl, whisk together ½ cup of beef broth and 1 tablespoon of cornstarch until smooth, then pour it into the skillet. Add ½ cup of ketchup, 1 tablespoon of Worcestershire sauce, salt, and pepper, stirring everything together. Let this mixture simmer for 3–5 minutes on medium heat, thickening to a rich, saucy consistency.

Once your Philly Cheese Steak Sloppy Joes mixture is thick and bubbling, turn off the heat. Stir in 1 cup of chopped provolone cheese, mixing until it melts into the savory filling, creating a wonderfully creamy texture.

Grab 4 toasted brioche buns and generously spoon the gooey, hearty filling onto each one. Make sure to mound it high for that satisfying, messy experience that Sloppy Joes are known for. Serve immediately, and watch as everyone dives into these delicious Philly Cheese Steak Sloppy Joes, thrilled with every cheesy bite!