Add minced garlic to the mushrooms and cook for another minute until fragrant.
Stir in fresh spinach and cook until wilted, about 2 minutes.
Pour in the heavy cream and mix well. Add grated Parmesan cheese and stir until melted into a creamy sauce.
Add the drained pasta to the skillet and toss to coat in the sauce. If needed, add reserved pasta water a little at a time until the sauce reaches your desired consistency.
Season with salt and pepper to taste. Serve hot, garnished with extra Parmesan and fresh parsley if desired.
Notes
You can swap the heavy cream with coconut milk for a dairy-free version. Add grilled chicken or shrimp for extra protein.