01 - Cook the pasta according to package instructions in salted boiling water until al dente. Reserve 1/2 cup of the pasta cooking water, then drain and set aside.
02 - While the pasta cooks, season the chicken pieces with salt, pepper, and dried Italian herbs.
03 - Heat olive oil in a large skillet over medium-high heat. Add the chicken and cook for 5–7 minutes, stirring occasionally, until golden and cooked through. Transfer the chicken to a plate and set aside.
04 - In the same skillet, reduce heat to medium. Melt the butter, then add the minced garlic. Sauté for 1–2 minutes until fragrant.
05 - Sprinkle in the flour and cook, stirring constantly, for 1 minute to form a roux.
06 - Gradually whisk in the milk and heavy cream until smooth and slightly thickened, about 3–4 minutes.
07 - Stir in the grated Parmesan cheese and nutmeg (if using). Continue stirring until the cheese is melted and the sauce is creamy. Season with salt and pepper to taste.
08 - Return the cooked chicken to the skillet, then add the drained pasta. Toss everything together, adding reserved pasta water as needed to reach a silky consistency. Remove from heat. Garnish with chopped parsley and extra Parmesan before serving.