01 - Season both sides of each chicken breast generously with salt, black pepper, and Italian seasoning. Press the seasoning gently into the meat to ensure even distribution.
02 - Heat olive oil and butter in a large skillet over medium-high heat until butter foams. Add chicken breasts and cook for 5–7 minutes per side until golden brown and internal temperature reaches 165°F. Transfer to a plate and cover loosely with foil.
03 - Reduce heat to medium. Add chopped onion and minced garlic to the same skillet. Sauté for 2–3 minutes, stirring frequently, until onion becomes translucent and garlic releases its fragrance without browning.
04 - Pour in chicken broth, using a wooden spoon to scrape up browned bits from the bottom of the skillet. Allow liquid to simmer for 2 minutes, reducing slightly to concentrate flavors.
05 - Stir in heavy cream and grated Parmesan cheese. Whisk continuously until cheese melts completely and sauce becomes smooth and velvety. Simmer gently for 2–3 minutes until sauce coats the back of a spoon.
06 - Return chicken breasts to the skillet, spooning sauce over the top. Simmer for 3–5 minutes until chicken is heated through and flavors meld. Garnish with fresh parsley and additional Parmesan before serving.