01 - Pat the chicken thighs dry with paper towels and season both sides generously with salt and freshly ground black pepper.
02 - Heat the 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. Transfer the chicken to a plate and set aside.
04 - Reduce the heat to medium. Add the diced onion to the same skillet and cook for 2 to 3 minutes until softened. Stir in the minced garlic and cook for 1 additional minute until fragrant.
05 - Pour in the chicken broth, scraping up any browned bits from the bottom of the skillet to incorporate all the fond into the sauce.
06 - Reduce the heat to medium-low. Stir in the heavy cream, dried thyme, dried rosemary, dried oregano, and chopped parsley. Mix until well combined and the sauce is smooth.
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. Cover 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.
08 - Taste the sauce and adjust the seasoning with additional salt and pepper as needed. Garnish with extra fresh parsley and serve immediately.