01 - Bring a large pot of salted water to a boil. Cook pasta according to package instructions until al dente. Reserve 1/2 cup pasta water, then drain and set aside.
02 - Heat olive oil and butter in a large skillet over medium heat. Add mushrooms and sauté for 5–7 minutes until golden and tender.
03 - Add minced garlic and cook for 1 minute until fragrant.
04 - Stir in the spinach and cook for 1–2 minutes, just until wilted.
05 - Pour in the heavy cream and vegetable broth. Bring to a gentle simmer.
06 - Add Parmesan, black pepper, salt, and nutmeg (if using). Stir until the cheese melts and the sauce thickens slightly, 2–3 minutes.
07 - Add the cooked pasta to the skillet. Toss to coat in the sauce, adding reserved pasta water as needed for a silky consistency.
08 - Serve immediately, garnished with extra Parmesan and fresh parsley.