01 -
Warm up a big cast iron pan over medium-high heat. Drop in the ground beef and let it sit without touching it until it gets a nice dark crust on the bottom. Once that’s done, break it apart and keep cooking until about half the beef shows a golden crust—it’s all about boosting flavor here!
02 -
Take out the cooked beef but leave any juices behind. Melt the butter in the same pan, then toss in the mushrooms, diced onion, and bell pepper. Let them sit untouched for a minute or two to get that golden color, then stir and repeat so they caramelize nicely.
03 -
Put the beef back in with the veggies. Mix the cornstarch into the beef broth until smooth in a separate small cup, then add this into the skillet. Stir in ketchup, Worcestershire sauce, black pepper, and salt. Make sure it’s all well combined.
04 -
Let everything simmer for 3-5 minutes, stirring now and then. It should thicken up and look more like a rich filling instead of a thin stew.
05 -
Turn off the heat and stir in your Provolone chunks. Keep mixing until the cheese is completely melted and covering the beef mixture.
06 -
Scoop the warm, cheesy beef and veggie mix onto your toasted brioche buns. Go ahead and dig in right away!