2 cups shredded provolone cheese
1 cup shredded mozzarella cheese
For the Philly Cheesesteak Topping:
1 lb beef sirloin or ribeye, thinly sliced
1 tablespoon olive oil
1 small onion, thinly sliced
1 green bell pepper, thinly sliced
1 cup sliced mushrooms (optional)
2 cloves garlic, minced
1 teaspoon Worcestershire sauce
Salt and pepper to taste
4 slices provolone cheese (or more, as needed)
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