Cook the fettuccine pasta according to package directions until al dente.
In a large skillet, melt butter over medium heat.
Add minced garlic and sauté until fragrant, about 30 seconds.
Pour in the heavy cream and bring to a simmer.
Stir in grated Parmesan cheese until melted and smooth.
Season with salt and pepper to taste.
Add sliced cooked chicken to the skillet and heat through.
Drain the pasta and add it to the sauce, tossing to coat evenly.
Serve hot, garnished with fresh parsley.
Enjoy your delicious chicken alfredo pasta!