Creating Mushroom Alfredo is simple when you follow these steps:

1. Cook the Pasta: In a large pot of salted boiling water, cook the fettuccine according to package instructions until al dente. Drain and set aside.
2. Sauté the Vegetables: In a large skillet, heat olive oil over medium heat. Add the chopped onion and sauté until translucent, about 3-4 minutes.
3. Add Garlic and Mushrooms: Stir in the minced garlic and sliced mushrooms. Cook until the mushrooms are golden brown and tender, about 5-7 minutes.
4. Make the Sauce: Pour in the heavy cream and bring to a gentle simmer. Allow it to cook for 2-3 minutes until it slightly thickens.
5. Add Cheese: Remove the skillet from heat and stir in the grated Parmesan cheese until melted and creamy. Season with salt and pepper to taste.
6. Combine Pasta and Sauce: Add the cooked pasta to the skillet and toss until evenly coated in the creamy mushroom sauce.
7. Garnish and Serve: Transfer to serving plates, garnish with fresh parsley, and enjoy!

These straightforward steps will guide you in creating a stunning Mushroom Alfredo that is sure to impress!