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Preheat the Oven:
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Preheat your oven to 375°F (190°C).
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Line a baking sheet with parchment paper or lightly grease it.
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Prepare the Garlic Butter:
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In a small bowl, combine the softened butter and minced garlic. Mix well.
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Cut the loaf of bread in half lengthwise and spread the garlic butter evenly over both halves. Place the bread halves on the prepared baking sheet, cut side up.
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Cook the Vegetables and Steak:
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In a large skillet over medium-high heat, add a drizzle of oil (if needed) and sauté the sliced bell pepper and onion until tender and slightly caramelized, about 5-7 minutes. Remove from the skillet and set aside.
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In the same skillet, add the thinly sliced steak and cook until browned and cooked through, about 3-5 minutes. Season with salt, pepper, and Worcestershire sauce. Remove from heat.
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Assemble the Cheesy Bread:
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Evenly distribute the cooked bell pepper, onion, and steak over the garlic buttered bread halves.
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Sprinkle the shredded provolone cheese, mozzarella cheese, and grated Parmesan cheese evenly over the top of the steak and vegetables.
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Bake:
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Bake in the preheated oven for 15-20 minutes, or until the cheese is melted and bubbly and the bread is crispy.
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Serve:
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Remove from the oven and let cool slightly.
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Garnish with chopped fresh parsley if desired.
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Slice the cheesy bread into pieces and serve warm.