The Best Vegan Cheesesteaks

Ingredients
Method
Heat a large cast-iron or other heavy skillet over high heat, then add 2 Tbsp. canola oil. Add 1 lb. mixed mushrooms (such as cremini, shiitake, and king oyster), sliced, ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt, and ¼ tsp. freshly ground black pepper and cook, stirring occasionally, until mushrooms are browned and any liquid has evaporated, about 7 minutes.
Lower heat to medium-high and add 1 cup chopped onion and remaining 1 Tbsp. canola oil. Cook, stirring often, until onions are browned, about 5 minutes. Stir about 2 Tbsp. sauce into mushroom-onion mixture.
Coat two 6" soft hoagie rolls, warmed but not toasted, split on cut sides with remaining sauce. Divide mushroom-onion mixture between hoagie rolls and serve immediately.