Bring a large pot of salted water to a boil.
Cook the fettuccine according to the package instructions until al dente.
Reserve about 1 cup of pasta water, then drain the fettuccine and set aside.
In a large skillet or saucepan, melt the butter over medium heat.
Add the minced garlic and cook for about 1 minute until fragrant.
Pour in the heavy cream and bring to a gentle simmer. Cook for about 5 minutes, stirring occasionally, until the cream has slightly thickened.
Reduce the heat to low and gradually stir in the grated Parmesan cheese until melted and well combined. The sauce should be smooth and creamy.
Season with salt and pepper to taste.
Add the cooked fettuccine to the skillet with the Alfredo sauce.
Toss the pasta gently to coat it evenly with the sauce. If the sauce is too thick, add a little reserved pasta water to reach the desired consistency.
Garnish the Fettuccine Alfredo with chopped fresh parsley if desired.
Enjoy your meal!