01 - Generously season both sides of each chicken breast with salt, black pepper, and Italian seasoning, pressing the spices into the meat to ensure even coverage.
02 - Heat olive oil and butter in a large skillet over medium-high heat until the butter foams. Add chicken breasts and cook for 5–7 minutes per side until golden brown and internal temperature reaches 165°F. Transfer chicken to a plate and tent with foil.
03 - Reduce heat to medium. Add finely chopped onion and minced garlic to the same skillet, sautéing for 2–3 minutes until fragrant, translucent, and just beginning to caramelize.
04 - Pour in chicken broth, using a wooden spoon to scrape up browned bits from the bottom of the skillet. Allow the liquid to simmer for 2 minutes, reducing slightly.
05 - Stir in heavy cream and grated Parmesan cheese, whisking continuously until the cheese melts and the sauce becomes smooth and velvety. Simmer gently for 2–3 minutes until slightly thickened.
06 - Return chicken breasts to the skillet, spooning sauce over the top. Simmer for 3–5 minutes, allowing the chicken to absorb the flavors and the sauce to coat everything evenly.
07 - Sprinkle with fresh chopped parsley and additional Parmesan cheese if desired. Serve immediately while hot, accompanied by your choice of sides.