In a large pot, bring salted water to a rolling boil. Add the fettuccine and cook according to package instructions, typically around 8-10 minutes, until al dente. Once cooked, drain the pasta and set aside in a large bowl or on a plate.
While the pasta is cooking, heat the olive oil in a large skillet over medium heat. Season the sliced chicken breasts generously with salt and freshly ground black pepper. Place the seasoned chicken in the skillet and cook for 6-7 minutes, flipping once, until the chicken is golden brown and fully cooked through. Remove the chicken from the skillet and transfer it to a plate, covering it to keep warm.
In the same skillet, reduce the heat slightly and add the minced garlic. Sauté for approximately 1 minute, stirring frequently, until fragrant but not browned.
Next, pour in the heavy cream, stirring gently to combine. Bring the mixture to a gentle simmer and allow it to reduce slightly for about 2-3 minutes. Gradually add the freshly grated Parmesan cheese and Italian seasoning. Stir continuously until the cheese melts completely and the sauce is creamy and smooth. Taste and adjust seasoning with additional salt and pepper if needed.
Gently fold the cooked fettuccine and sliced chicken back into the Alfredo sauce. Toss thoroughly until all the pasta is evenly coated with the rich sauce. Allow everything to heat through for an additional 2-3 minutes, stirring occasionally.
Once heated, remove from the stove and transfer the creamy pasta to serving plates. Garnish with a generous sprinkling of freshly chopped parsley.
Notes
Serve in shallow bowls with extra Parmesan and a wedge of lemon.