Bring a large pot of salted water to a boil.
Add the fettuccine and cook until al dente, according to the package instructions.
Reserve 1 cup of pasta cooking water, then drain the pasta.
In a large skillet, heat the heavy cream and butter over medium heat until the butter is melted and the mixture is heated through.
Gradually whisk in the grated Parmesan cheese until the sauce is smooth and creamy.
Add the cooked fettuccine to the skillet and toss to coat the pasta with the Alfredo sauce.
If the sauce is too thick, add some of the reserved pasta cooking water, a little at a time, until the desired consistency is reached.
Season with salt and black pepper to taste.
Garnish with chopped fresh parsley if desired.
Enjoy your meal!