Let’s dive into the step-by-step process of bringing this dish to life. Remember, cooking is about the journey as much as the destination, so enjoy each step!

1. Preheat your oven to 375°F (190°C) and line a baking dish with parchment paper.
2. Place the halved bell peppers in the dish, cut side up, and drizzle with olive oil. Sprinkle with a bit of salt and pepper.
3. In a large skillet over medium heat, add the remaining olive oil and sauté the onions and mushrooms until they’re tender and the onions are translucent, about 5-7 minutes.
4. Add the thinly sliced beef steak to the skillet. Season with garlic powder, onion powder, and Worcestershire sauce. Cook until the beef is browned and cooked through, about 5 minutes.
5. Place a slice of provolone cheese inside each pepper half. Then, divide the beef mixture evenly among the peppers. Top each with another slice of cheese.
6. Cover the baking dish with aluminum foil and bake for 25-30 minutes, or until the peppers are tender and the cheese is melted and bubbly.
7. Let them cool slightly before serving. Enjoy the flavors melding together just as they do in your favorite Philly Cheesesteak.