**Directions:**
Prepare the Beef Topping:
Heat olive oil in a large skillet over medium-high heat.
Add the thinly sliced beef and cook until browned and cooked through, about 4-5 minutes. Remove from the skillet and set aside.
In the same skillet, add the onion, bell pepper, and mushrooms (if using). Cook until softened, about 5 minutes.
Add the minced garlic and cook for an additional 1 minute.
Return the cooked beef to the skillet and stir in the Worcestershire sauce. Season with salt and pepper to taste. Remove from heat.
Prepare the Bread:
Preheat your oven to 375°F (190°C).
Place the halved bread on a baking sheet and brush the cut sides with melted butter.
Sprinkle the shredded provolone and mozzarella cheeses evenly over the bread.
Assemble the Cheesy Bread:
Evenly distribute the Philly cheesesteak mixture over the cheesy bread.
Place the bread under the broiler for 2-3 minutes, or until the cheese is melted and bubbly. Watch carefully to avoid burning.
Add Provolone Cheese Slices:
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