01 - Pat the chicken thighs dry with paper towels and season generously on both sides with salt and freshly ground black pepper.
02 - Heat olive oil and butter together in a large skillet over medium-high heat until the butter is melted and begins to foam.
03 - Place the chicken thighs skin side down in the skillet and sear for 5 to 6 minutes per side until the skin is deeply golden brown and crisp. Remove the chicken from the skillet and set aside on a plate.
04 - In the same skillet, add the finely diced onion and cook for 2 to 3 minutes until softened and translucent. Add the minced garlic and cook for 1 minute until fragrant, stirring constantly to prevent burning.
05 - Pour in the chicken broth, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Let the broth reduce slightly for about 1 minute.
06 - Reduce the heat to medium-low. Stir in the heavy cream, dried thyme, dried rosemary, dried oregano, and chopped parsley. Whisk gently until the sauce is smooth and well combined.
07 - Return the seared chicken thighs to the skillet, placing them skin side up. Spoon some of the cream sauce over the top of each thigh.
08 - Cover the skillet with a lid and simmer gently for 15 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the sauce has thickened to a silky consistency.
09 - Taste the sauce and adjust the seasoning with additional salt and pepper if needed. Garnish with extra chopped fresh parsley and serve immediately over mashed potatoes, rice, or alongside crusty bread.