1 onion, halved and cut into thin slices
1 green bell pepper, halved and cut into thin strips
8 ounces cremini mushrooms, thinly sliced
4 tablespoons vegetable oil, divided
1 tablespoon Worcestershire sauce
2 tablespoons Montreal steak seasoning, divided
1 ⅓ pound flank steak
1 cup shredded provolone cheese
4 hoagie rolls
Preheat the oven to 350° Fahrenheit.
Combine the onions, peppers, mushrooms, 3 tablespoons of the oil and ½ tablespoon of the steak seasoning in a bowl. Toss well to combine and set aside.
Rub the flank steak with the remaining oil and the Worcestershire sauce, and season on all sides with the remaining Montreal seasoning. Place in the center of nonstick baking sheet, and scatter the vegetables around the steak.
Bake for 15 minutes, then turn on the broiler and broil for about 5 minutes, or until nice and brown.
Remove the flank steak from the tray, and thinly slice across the grain. Add the pieces of steak back to the tray and cover with the cheese. Broil until the cheese is melted.
Pile the filling on the rolls and serve.