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