In a large skillet over medium heat, heat 1 TBSP oil. Add peppers and onion and season with salt. Cook, stirring often, until caramelized, 12 to 15 minutes.
Remove onions and peppers from skillet and set aside. Add meat until it is thoroughly heated. Season with salt and pepper, if desired.
Return veggies to skillet and toss to combine with meat. Blanket mixture with provolone and cook, covered, until the cheese is melted, about 3 minutes more. Divide mixture among hoagie rolls and serve.
In a large skillet over medium heat, heat 1 TBSP oil. Add peppers and onion and season with salt. Cook, stirring often, until caramelized, 12 to 15 minutes.
Remove onions and peppers from skillet and set aside. Add meat until it is thoroughly heated. Season with salt and pepper, if desired.
Return veggies to skillet and toss to combine with meat. Blanket mixture with provolone and cook, covered, until the cheese is melted, about 3 minutes more. Divide mixture among hoagie rolls and serve.
