In a large pot of boiling salted water, cook the fettuccine pasta according to the package instructions until al dente. Drain the pasta and reserve about 1 cup of the pasta cooking water. Set the drained pasta aside.
Generously season both sides of the chicken breasts with salt, pepper, and garlic powder for enhanced flavor.
In a large skillet over medium heat, melt 2 tablespoons of butter. Once the butter is melted and bubbling, add the seasoned chicken breasts. Cook for approximately 6-8 minutes on each side, or until the chicken is golden brown and no longer pink in the center. Once cooked, remove the chicken from the skillet and let it rest on a cutting board before slicing it into strips.
In the same skillet, add the remaining 2 tablespoons of butter along with the minced garlic. Sauté the garlic for 1-2 minutes, stirring constantly until it becomes fragrant but be careful not to let it burn.
Slowly pour in the heavy cream, stirring well to combine with the garlic butter. Allow the mixture to come to a gentle simmer.
Gradually whisk in the grated Parmesan cheese, stirring continuously until the cheese melts completely and forms a smooth sauce. Add the Italian seasoning and taste, adjusting the seasoning with salt and freshly cracked black pepper as desired.
If the sauce appears too thick, gradually add small amounts of the reserved pasta water, stirring until your desired creamy consistency is achieved.
Add the drained fettuccine and sliced chicken pieces to the Alfredo sauce. Toss gently to ensure that all the pasta and chicken are evenly coated with the rich, creamy sauce.
Serve the dish hot, garnished with a sprinkle of finely chopped fresh parsley for a dash of color and fresh flavor.
Notes
For a lighter version, use half-and-half instead of heavy cream.