Heat a large skillet and add the ground beef. Cook for a few minutes and stir (No need to drain if using 93% lean ground beef or 93% lean ground turkey).
Add the onion, green pepper and mushrooms. Cook, stirring occasionally, until meat is almost completely brown.
Stir in Worcestershire sauce, tomato paste, garlic powder, steak seasoning, salt, pepper. Cook until meat is done.
Whisk the cornstarch with the beef broth and pour into the meat mixture. Cook, stirring, until thickened.
Taste and adjust salt if needed.
Add the cubed provolone cheese and stir. Take pan off of the heat. Cover and let sit for a couple of minutes until cheese is melted.
Serve on hamburger buns (toast them for even better flavor).
*Use 2 Tbsp A-1 steak sauce in place of the seasoning if desired.