Step 1: Prepare the Chicken and Vegetables: Pat the chicken pieces dry with paper towels and season with salt and pepper. Chop the onion, carrots, and celery into bite-sized pieces. Mince the garlic. Peel and cube the Yukon Gold potatoes.
Step 2: Saut Aromatics: Heat the olive oil in a large Dutch oven or oven-safe pot over medium heat. Add the chopped onion, carrots, and celery and saut for 5-7 minutes, or until softened. Add the minced garlic, dried thyme, and dried rosemary and cook for another minute, until fragrant.
Step 3: Brown the Chicken: Add the seasoned chicken to the pot and cook, stirring occasionally, until browned on all sides. Do not overcrowd the pot; cook in batches if necessary to ensure even browning.
Step 4: Add Broth and Potatoes: Pour the chicken broth into the pot, scraping up any browned bits from the bottom. Add the cubed Yukon Gold potatoes and bring the mixture to a simmer.
Step 5: Bake or Simmer: Cover the pot and either bake in a preheated oven at 375F (190C) for 30 minutes or simmer on the stovetop over low heat for 30 minutes, or until the chicken is cooked through and the potatoes are tender.
Step 6: Add Peas and Thicken (Optional): Stir in the frozen peas and cook for another 5 minutes, until heated through. If desired, create a slurry by whisking together the cornstarch and cold water. Slowly pour the slurry into the pot, stirring constantly, until the stew thickens to your desired consistency.
Step 7: Serve: Remove the pot from the oven (or stovetop) and let it cool slightly. Serve hot, garnished with fresh parsley if desired.
Optional Tips: For a richer flavor, use bone-in, skin-on chicken thighs and brown them well before adding the vegetables. Other vegetables, such as parsnips, sweet potatoes, or mushrooms, can be substituted or added to the stew. If you don't have chicken broth, vegetable broth can be used as a substitute. For extra flavor, add a bay leaf to the stew during cooking and remove it before serving.