Gather all your ingredients and prepare them by washing, peeling, and chopping as needed.
In a large skillet, heat the olive oil over medium heat. Add the turkey pieces and sear for 5-7 minutes until lightly browned. Remove and set aside.
In the same skillet, sauté the diced onion and minced garlic for 3-4 minutes until the onion is translucent. Add the carrots, potatoes, and green beans, then stir in the thyme, rosemary, salt, and pepper.
Transfer the sautéed vegetables and turkey into the crockpot. Pour in the chicken broth and add the bay leaf. Stir gently to combine.
Cover the crockpot and cook on low for 6-8 hours or on high for 3-4 hours. Add the cornstarch slurry during the last 30 minutes if you prefer a thicker stew.
Once cooking is complete, remove the bay leaf, adjust seasoning if needed, and serve the stew garnished with fresh parsley.