Cook fettuccine according to package directions. Drain, reserving about 1 cup of pasta water.
While pasta cooks, heat olive oil in a large skillet over medium-high heat. Season chicken pieces with salt and pepper. Add chicken to the skillet and cook until browned and cooked through, about 5-7 minutes. Remove chicken from skillet and set aside.
Add minced garlic to the same skillet and cook until fragrant, about 1 minute.
Pour in heavy cream and bring to a simmer. Reduce heat to low and stir in grated Parmesan cheese and butter until melted and smooth.
Return the cooked chicken to the skillet. Add the drained fettuccine to the skillet with the sauce. Toss to coat. If the sauce is too thick, add a little of the reserved pasta water until it reaches your desired consistency.
Serve immediately, garnished with fresh parsley.
Notes
For a richer sauce, use half-and-half instead of heavy cream.
Ensure your Parmesan cheese is finely grated for a smoother sauce.
This recipe is a great option for a quick weeknight dinner, similar to what you might find from some meal planning services.