1. Cook pasta according to package instructions until al dente.

2. In a skillet, sauté mushrooms, garlic, and onions in butter until tender.

3. Add heavy cream, parmesan cheese, salt, and pepper to the skillet. Stir until the sauce thickens and cheese is melted.

4. Toss cooked pasta in the mushroom sauce until fully coated.

5. Serve hot and garnish with fresh parsley and more parmesan cheese.