1Cook the fettuccine pasta according to the package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium-high heat. Add the marinated chicken and cook until fully cooked and browned, about 5-7 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add the minced garlic and sauté for about 1 minute until fragrant.
Pour in the milk and cream, stirring constantly. Bring the mixture to a simmer.
Gradually add the grated Parmesan cheese, stirring until the cheese is melted and the sauce is smooth.
Season the sauce with salt and pepper to taste.
Add the cooked fettuccine pasta and the cooked chicken back into the skillet. Toss everything together until the pasta and chicken are well coated with the sauce.
Serve the Classic Chicken Alfredo Pasta hot, garnished with additional Parmesan cheese if desired.