In a large pot, bring salted water to a boil. Add the pasta and cook according to package instructions until al dente. Reserve about 1 cup of the pasta cooking water, then drain the rest and set aside.

In a large skillet, heat the olive oil over medium heat. Add the sliced mushrooms and cook for about 5 minutes, or until they are golden and tender. Stir occasionally for even cooking.

Add the minced garlic to the skillet and sauté for about 1 minute, just until fragrant. Then add the fresh spinach and cook until it wilts, which should take about 2-3 minutes.

Reduce the heat to low, then add the cooked pasta to the skillet alongside the grated Parmesan cheese. Toss everything together, adding a splash of the reserved pasta water if needed to create a creamy sauce.

Taste and season with salt and pepper as desired. Remove from heat and serve immediately, garnished with extra Parmesan if you like!