Oven-Braised Chicken Stew

Ingredients (15 items)

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• 2 pounds boneless, skinless chicken thighs
• salt and ground black pepper to taste
• 1 tablespoon extra-virgin olive oil
• 1 tablespoon unsalted butter
• 2 cups chopped onions
• 3 cups chopped carrots
• 1 ½ cups chopped celery
• 1 (16 ounce) package fresh mushrooms, quartered
• 3 cups trimmed and chopped fresh green beans
• 2 tablespoons minced garlic
• ¾ cup dry white wine
• 3 cups chicken broth, or as needed
• 2 sprigs fresh rosemary, or to taste
• 3 tablespoons cornstarch
• 2 tablespoons water, or as needed