In a large pot of salted boiling water, cook the fettuccine according to package instructions until al dente. Drain and set aside, reserving ½ cup of the pasta water.
While the pasta cooks, season the chicken breasts with salt, pepper, and Italian seasoning on both sides.
In a large skillet, heat the olive oil over medium-high heat. Once hot, add the chicken breasts. Cook for about 6-7 minutes on each side, or until thoroughly cooked and golden brown. Once cooked, remove the chicken from the skillet and let it rest for 5 minutes before slicing into strips.
In the same skillet over medium heat, add the minced garlic and sauté for about 1 minute until fragrant. Pour in the heavy cream and bring to a gentle simmer. Reduce the heat to low, then gradually whisk in the grated Parmesan cheese until melted and smooth. If the sauce is too thick, use the reserved pasta water to reach your desired consistency.
Add the cooked fettuccine to the skillet and toss it in the Alfredo sauce until well coated.
Place the sliced chicken on top of the pasta, and gently toss to combine everything together. Adjust seasoning with salt and pepper, if needed.
Divide the creamy chicken Alfredo between two plates. Garnish with fresh parsley and extra grated Parmesan cheese.
Notes
Adjust seasoning to taste and use reserved pasta water for sauce consistency.