Chill the Beef: Place the beef in the freezer for 20 to 30 minutes to make it easier to slice.
Cook the Vegetables: Heat 2 tablespoons of vegetable oil in a large sauté pan and add onion and bell peppers, cooking until tender and caramelized for about 15-20 minutes.
Prep the Steak: Remove the beef from the freezer, trim fat, and slice thinly against the grain; chop into ¼-inch pieces.
Cook the Beef: Increase heat to medium-high and cook half of the beef, seasoned with ¾ teaspoon seasoned salt and ½ teaspoon garlic pepper for 4-5 minutes. Remove and repeat with remaining steak.
Prepare the Rolls: Preheat the oven to 400°F, split hoagie rolls, butter the insides, and toast for 3-5 minutes until golden.
Combine and Serve: Drain excess juices from the pan, return beef and veggies, top with provolone, cover, and cook until cheese melts (4-5 minutes). Transfer to toasted rolls.
Notes
For more flavor, customize with hot sauces or different cheese varieties. You can also use mushrooms as a vegetarian option.