Dice bell peppers, and slice mushrooms.
Cut salmon into thin strips.
Season salmon generously.
Heat oil, and add salmon.
Cook salmon until pink (1-2 minutes).
Add bell peppers, mushrooms; stir occasionally.
Lower heat and keep cooking.
Spread butter on hoagie rolls, and toast until golden brown.
Butter rolls again, add Provolone slices.
Toast until the cheese melts.
Transfer salmon mixture to rolls, and add toppings.
Add salt and pepper to taste. Enjoy!