Warm a large skillet over medium heat. Split the rolls and lightly toast with a dab of butter. Set aside.
Add olive oil to the skillet. Cook onions and bell pepper until soft and golden, 6–8 minutes.
Stir in mushrooms and a pinch of salt. Sauté until the mushrooms release liquid and brown, 3–4 minutes.
Push vegetables to one side. Melt remaining butter in the open space.
Add steak in an even layer. Season with salt and pepper. Sear, flipping once, until just cooked, 2–3 minutes.
Stir in garlic and Worcestershire. Fold vegetables into the steak and mix to coat.
Divide the mixture into 4 piles. Top each with provolone and let melt. Load into toasted rolls and spread mayo if using.
Notes
Swap provolone for white American or warm cheese sauce for a classic vibe. Add sliced hot cherry peppers for heat, or brush rolls with garlic butter before toasting for extra flavor. Leftovers reheat well in a skillet over medium heat for 2–3 minutes; assemble fresh into rolls.This recipe is an original creation inspired by classic Easy Philly Cheesesteak Sandwiches flavors. All ingredient ratios and instructions are independently developed.