01 - Pat the chicken thighs dry with paper towels. Season both sides generously with salt and pepper. Lightly dredge each thigh in flour, shaking off any excess.
02 - Heat olive oil in a large Dutch oven or heavy-bottomed pot over medium-high heat. Sear the chicken thighs in batches, about 4 minutes per side, until deeply golden brown. Transfer to a plate and set aside.
03 - In the same pot, add the diced onion, carrots, and celery. Sauté for 5 to 6 minutes until the vegetables have softened. Add the minced garlic and cook for 1 additional minute until fragrant.
04 - Pour in the dry white wine, using a wooden spoon to scrape up any browned bits from the bottom of the pot. Let the wine reduce for 2 to 3 minutes.
05 - Add the diced tomatoes with their juices, chicken stock, dried thyme, and bay leaf. Nestle the browned chicken thighs back into the pot. Bring to a gentle simmer.
06 - Cover the pot with a tight-fitting lid and reduce heat to low. Cook for 1 hour, stirring occasionally, until the chicken is fork-tender and nearly falling off the bone.
07 - Remove the lid for the final 15 minutes of cooking to allow the sauce to thicken and concentrate in flavor.
08 - Remove from heat and stir in the lemon zest and chopped parsley. Taste and adjust seasoning with additional salt and pepper as needed. Serve hot over polenta, mashed potatoes, or alongside crusty bread.