01 - Pat chicken thighs thoroughly dry with paper towels. Season generously on both sides with salt and pepper, pressing seasoning into the meat.
02 - Heat olive oil in a large Dutch oven or deep skillet over medium-high heat until shimmering. Place chicken thighs skin side down and sear until deep golden brown, about 5 minutes. Flip and cook another 5 minutes. Remove chicken and set aside on a plate.
03 - Add onion, carrot, celery, and bell pepper to the same pot. Sauté for 5 minutes until vegetables begin to soften. Add garlic and cook for 1 minute until fragrant, stirring constantly to prevent burning.
04 - Pour in white wine if using, scraping up any browned bits from the bottom with a wooden spoon. Let the wine bubble and reduce for about 1 minute.
05 - Stir in diced tomatoes, chicken broth, oregano, thyme, basil, bay leaf, and lemon zest if using. Bring the mixture to a gentle simmer.
06 - Return chicken thighs to the pot, arranging them skin side up. The liquid should come about halfway up the chicken. Cover with a tight-fitting lid, reduce heat to low, and braise for 40 minutes until chicken is tender and cooked through.
07 - Remove the lid and increase heat slightly. Simmer uncovered for 10 minutes to allow the sauce to reduce and thicken naturally.
08 - Discard the bay leaf. Transfer chicken to a serving platter. Spoon the thickened vegetable sauce over the chicken. Sprinkle generously with fresh parsley. Serve hot accompanied by polenta, crusty bread, or pasta.