01 - Season both sides of the chicken breasts generously with salt, black pepper, and Italian seasoning, ensuring even coverage.
02 - Heat olive oil and butter in a large skillet over medium-high heat. Add the seasoned chicken breasts and cook for 5–7 minutes per side until golden brown and cooked through. Remove chicken from the skillet and set aside on a plate.
03 - Reduce heat to medium. In the same skillet, add the chopped onion and minced garlic. Sauté for 2–3 minutes, stirring frequently, until fragrant and translucent.
04 - Pour in the chicken broth, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Let the mixture simmer for 2 minutes to reduce slightly.
05 - Stir in the heavy cream and grated Parmesan cheese. Whisk continuously until the cheese is fully melted and the sauce becomes smooth and velvety. Simmer gently for another 2–3 minutes until the sauce thickens enough to coat the back of a spoon.
06 - Return the chicken breasts to the skillet, turning them to coat thoroughly in the sauce. Simmer for 3–5 minutes, allowing the flavors to meld together. Sprinkle with fresh chopped parsley and additional Parmesan cheese if desired. Serve immediately.