Oven-Braised Chicken Stew

Ingredients (16)

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