Prepare 12 oz fettuccine noodles according to package directions until al dente.
Slice 3 chicken breasts against the grain into strips.
In a large skillet, melt 1 Tablespoon butter over medium heat. Add the chicken and season with ½ teaspoon salt and ¼ teaspoon pepper.
Sauté the sliced chicken in the butter until slightly browned and cooked through (7-10 minutes).
Add 1 Tablespoon minced garlic and cook for 1 minute until fragrant.
Remove the chicken from the pan and set aside.
Add the remaining 5 Tablespoons butter to the skillet and melt over medium-low heat.
Slowly whisk in 2 cups heavy whipping cream and simmer for 3 minutes, stirring constantly (do not boil).
Remove from heat and gradually whisk in 1½ cups grated Parmesan cheese, adding a little at a time until fully melted and smooth.
Add the cooked pasta and chicken back into the sauce and toss to coat.
Serve warm and enjoy!
Video
Notes
Refrigerate the leftovers in an air tight container for up to 5 days. Add a little more heavy whipping cream or milk when reheating to make the mixture creamy again.