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Bring a large pot of salted water to a boil and add pasta. Cook according to the package instructions and drain, reserving about a cup of pasta water.
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Meanwhile, heat a large pan over a medium-high heat. Add enough oil to cover the base of the pan and let that heat through. Then add mushrooms, garlic, and salt to taste. Cook for about 4 minutes, stirring a couple of times until the mushrooms are browning. Add 2 tablespoons of butter, or to taste, and stir to combine and butter is melted.
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Add drained pasta to the pan with the mushrooms and stir. Add ¼ cup parmesan or more, to taste. If the pasta is a little dry, stir in some of the pasta water to loosen the sauce a little.
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Remove from heat and serve with parsley, pepper, and more parmesan, if desired.