Classic Chicken and Dumplings Recipe

Name: Classic Chicken and Dumplings Recipe
Ingredients: 1 tablespoon olive oil; 6 bone-in, skin-on chicken thighs (about 2 pounds); kosher salt and black pepper; 4 stalks celery, chopped; 4 carrots, chopped; 2 onions, chopped; 2 tablespoons fresh thyme leaves or 2 teaspoons dried thyme; 2 cloves garlic, chopped; 2 bay leaves; 2 ½ cups all-purpose flour; 1 tablespoon baking powder; ½ teaspoon baking soda; 6 tablespoons (¾ stick) unsalted butter, melted; ¾ cup buttermilk; 2 tablespoons chopped fresh flat-leaf parsley leaves, plus more for serving