01 - Generously season chicken breasts on both sides with salt and black pepper.
02 - Melt unsalted butter and, if using, olive oil in a large skillet over medium-high heat. Sear chicken breasts for 6 to 8 minutes per side until golden and fully cooked. Remove from skillet and keep warm.
03 - Lower heat slightly. In the same skillet, add chopped onion and minced garlic. Sauté for 2 to 3 minutes until softened and fragrant.
04 - Pour in chicken broth, scraping up any browned bits with a wooden spoon. Let simmer for 2 minutes.
05 - Reduce to medium heat. Stir in heavy cream, chopped parsley, chives, basil, and thyme. Simmer gently for 3 to 4 minutes until slightly thickened.
06 - Return chicken breasts to the skillet, spoon sauce over each, and cook for an additional 2 to 3 minutes until heated through.
07 - Garnish with extra herbs if desired and serve warm.