01 - Preheat oven to 350°F.
02 - Pat chicken thighs dry with paper towels. Season generously with salt and pepper.
03 - In a large Dutch oven or ovenproof casserole dish, heat olive oil over medium-high heat. Sear chicken thighs, skin side down, for 5-6 minutes until golden. Flip and cook another 3 minutes. Transfer chicken to a plate.
04 - In the same pot, add carrots, celery, and onion. Sauté 5 minutes until softened. Add garlic and cook 1 minute more.
05 - Add mushrooms and potatoes. Stir and cook for 3 minutes.
06 - Pour in white wine, scraping up any browned bits. Simmer for 2 minutes.
07 - Return chicken to the pot. Add chicken broth, bay leaves, thyme, and a pinch of salt and pepper. Bring to a simmer.
08 - Cover and transfer to preheated oven. Bake for 50 minutes.
09 - Remove from oven, discard bay leaves and thyme stems. Stir in peas and, if using, heavy cream. Return to oven uncovered for 10 more minutes. Sprinkle with fresh parsley and serve hot.