Bring a large pot of salted water to a boil and add both short and long pasta according to package instructions, subtracting one minute from the cooking time.
Reserve 1 cup of the cooking liquid, then drain the pasta but do not rinse it.
In a skillet, melt half of the butter and the olive oil over medium heat. Add the sliced mushrooms and cook for about 5 minutes until golden and tender.
Season mushrooms with salt and pepper, then add the minced garlic and remaining butter. Cook for an additional 2 minutes until fragrant.
Add the drained pasta to the skillet with the mushroom mixture, pour in the reserved pasta water, and stir in the freshly grated Parmesan cheese until well combined.
Adjust the seasoning as needed, then serve immediately, garnished with chopped parsley and additional Parmesan cheese.
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Notes
Store any leftovers in an airtight container in the refrigerator for up to 3 days.