In a large skillet, heat olive1 tablespoon olive oiloil with onions. Sauté on medium low heat until they become soft and translucent.
Once the onions are sautéed, add in the mushrooms and season with salt. This helps bring the moisture out of them to become soft as well as seasons them.
Once the mushrooms are soft, add in the shaved steak along with 2-3 tablespoons of your favorite steak seasoning.
Cook the steak until it's cooked through, about 8-10 minutes. Toss the steak around in the onions and mushrooms.
Spread mayo on the hoagie buns then place steak on the bottom roll and the provolone cheese on the top.
Place in the air fryer at 350°F (or in the oven) to toast the bread and melt the cheese. In the air fryer it'll take about 1-2 minutes and about 5-8 in the oven.