Heat oil in a nonstick skillet over medium heat. Add the sirloin steak and cook for 2 to 3 minutes. Flip the meat and cook for 2-3 minutes more.
Add in onion and peppers, and cook for 3 to 4 minutes or until fork tender.
Add in sliced mushrooms, Worcestershire sauce, salt, and pepper and cook for 3 minutes.
Add provolone on top and cover your pan so the cheese melts.
Remove from the stovetop, allow to cool slightly, and then divide among your meal prep containers.
Top with fresh herbs, if desired (such as parsley).