INGREDIENTS
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1 pound dry spaghetti
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3 tablespoons unsalted butter, divided
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1 tablespoon olive oil
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1 pound cremini mushrooms, cleaned, caps removed, and sliced
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6 cloves garlic, minced
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1/2 cup grated Pecorino Romano cheese, plus more for serving
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2 tablespoons coarsely chopped fresh flat-leaf parsley leaves