01 - Pat the chicken thighs dry with paper towels and season both sides generously with salt and pepper. Lightly dredge each thigh in flour, shaking off any excess coating.
02 - Heat olive oil in a large Dutch oven or heavy-bottomed pot over medium-high heat. Working in batches if needed, sear the chicken thighs until golden brown on both sides, approximately 4 minutes per side. Transfer the browned chicken 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 are softened and fragrant. Add the minced garlic and continue cooking for 1 additional minute.
04 - Pour the dry white wine into the pot, scraping up any browned bits from the bottom of the pan to deglaze. Allow the wine to reduce for 2 to 3 minutes.
05 - Add the diced tomatoes with their juices, chicken stock, dried thyme, and bay leaf. Stir to combine and return the seared chicken thighs to the pot, nestling them into the liquid. Bring to a gentle simmer.
06 - Cover the pot with a tight-fitting lid and reduce the heat to low. Cook for 1 hour, stirring occasionally, until the chicken is fall-off-the-bone tender.
07 - Remove the lid for the final 15 minutes of cooking to allow the sauce to reduce and thicken to your desired consistency.
08 - Remove from heat and stir in the lemon zest and fresh parsley. Taste and adjust seasoning with additional salt and pepper as needed. Serve hot over polenta, alongside mashed potatoes, or with crusty bread to soak up the sauce.