01 - Pat the chicken thighs dry with paper towels and season generously on all 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 lightly foaming.
03 - Place the chicken thighs skin side down in the skillet and sear for 5 to 6 minutes per side until deeply golden brown and crispy. Transfer to a plate and set aside.
04 - In the same skillet, add the 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 liquid 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, blending everything together until smooth.
07 - Return the seared chicken thighs to the skillet, placing them skin side up. Spoon some of the sauce over the top of each piece.
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 salt and pepper as needed. Garnish with additional fresh parsley and serve immediately over mashed potatoes, rice, or crusty bread.