01 - Pat chicken thighs thoroughly dry with paper towels. Season both sides generously with salt and black pepper, ensuring even coverage.
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 deeply golden brown, approximately 5 minutes. Flip and cook the second side for 5 minutes. Transfer seared chicken to a plate and set aside.
03 - Add sliced onion, carrot, celery, and bell pepper to the rendered fat in the pot. Sauté for 5 minutes, stirring occasionally, until vegetables begin to soften. Add minced garlic and cook for 1 additional minute until fragrant.
04 - Pour in white wine if using, using a wooden spoon to scrape up any browned bits from the bottom of the pot. Let the wine bubble and reduce for 1 minute.
05 - Stir in diced tomatoes, chicken broth, dried 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 in a single layer. Once liquid simmers, cover with a tight-fitting lid and reduce heat to low. Braise gently for 40 minutes.
07 - Remove the lid and continue simmering uncovered for 10 minutes. This allows the sauce to concentrate and thicken slightly while the chicken skin crisps.
08 - Discard the bay leaf. Transfer chicken and vegetables to a serving platter. Spoon the reduced sauce over the top. Garnish generously with chopped fresh parsley. Serve immediately with polenta, crusty bread, or pasta.