Heat the oil in a large skillet over med-high heat. Once hot, add the peppers and onions and cook until they start to soften, about 5 minutes. Then add in the beef. Cook until the beef is browned through and drain any grease out.

Stir in the garlic, beef broth, Worcestershire and ketchup. Then add seasoning to taste. Let it simmer for about 10 minutes to let the flavors meld a bit. Then make a cornstarch slurry by stirring together the cornstarch and water. Stir the slurry into the beef. Serve on some toasted rolls and provolone cheese.