
Heat oven to 400°F. Halve the peppers lengthwise, remove the seeds and bake cut-side up on a sheet pan for 10 minutes to soften.
Meanwhile, melt the butter in a skillet and cook the sliced onion and mushrooms over medium-high heat until soft and browned, 6 minutes.
Add the shaved steak, Worcestershire, salt and pepper and cook, breaking it up, just until no longer pink, 3-4 minutes.
Tuck a half slice of provolone into each pepper, fill with the steak mixture and top with another half slice.
Bake 10 minutes until the cheese is melted and bubbly.
Photo: DinnerDrop