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Preheat your oven to 350℉
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In a large skillet over medium heat, add oil and sliced steak. Be sure to drain any excess grease.
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Season the steak with garlic powder, onion powder, and chili powder, and cook it until it browns. Remove the cooked steak from the skillet and set it aside.
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In the same skillet, add oil sliced peppers, mushrooms, and onions. Stir and cook until they have softened.
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Add cream cheese, Worcestershire sauce, and beef broth to the skillet. Cook until the cream cheese melts.
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Return the beef back into the skillet and stir until the ingredients are well combined.
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Transfer the mix to a casserole dish and top the entire dish with slices of Provolone cheese.
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Bake the Philly Cheesesteak Casserole at 350 degrees f for 10-15 minutes or until the cheese melts.
