Season chicken with salt, pepper, and Italian seasoning.
Heat olive oil in a skillet over medium-high heat. Cook chicken on both sides until golden and cooked through. Transfer to a plate and cover.
Add butter to the same skillet. Sauté garlic for 1 minute.
Sprinkle in flour and whisk for 1-2 minutes.
Gradually pour in chicken broth while whisking until smooth.
Stir in heavy cream and bring to a gentle simmer.
Add Parmesan and stir until melted and sauce thickens.
Cook pasta according to package directions. Drain and add to the sauce.
Slice cooked chicken and arrange over pasta. Garnish with parsley before serving.