Heat a tablespoon of oil in a large skillet over medium heat. Add peppers and onions and season with salt. Cook, stirring until caramelized for about 15 minutes.
Remove the onions and peppers from the skillet and set aside.
For the “steak”:
Slice mushrooms into thin, long strips. Put them into a bowl.
Add the spice mixture. Mix well.
Place them all in a large pan, over medium heat.
Sautee for 20 minutes. Add a little bit of water if necessary, so the mushrooms won't burn. When ready, remove from heat.
Add the cooked veggies mixture and stir to combine.
Cover the mixture with vegan cheese and cover with a lid. Cook for 1 more minute.
Divide the mixture in the hoagie rolls and serve with some fresh chopped parsley on top.