01 - Heat olive oil and butter in a large skillet over medium heat. Season chicken breasts with salt and pepper on both sides. Place in the skillet and sear for 3 to 4 minutes per side until a golden crust forms. Remove and set aside on a plate.
02 - In the same skillet, add the chopped onion and cook for 2 to 3 minutes until softened and translucent. Add the minced garlic and sauté for 1 additional minute until fragrant.
03 - Add the cream cheese, milk, and Parmesan to the skillet. Whisk continuously until the mixture comes together into a smooth, creamy sauce. Stir in the dried Italian herbs and blend evenly.
04 - Return the seared chicken breasts to the skillet, nestling them into the sauce. Spoon the sauce over the chicken to coat. Reduce the heat to low, cover with a lid, and simmer gently for 15 to 18 minutes until the chicken reaches an internal temperature of 165°F and is fully cooked through.
05 - Transfer the chicken to serving plates and spoon the creamy sauce generously over each portion. Sprinkle with fresh chives or parsley and serve immediately.