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.
10 - Sprinkle with fresh parsley and serve hot.