Chicken & sweet potato dumplings

Ingredients

• 1 whole chicken, cut into parts
• 2 teaspoons salt
• 1 teaspoon black pepper
• 1 tablespoon canola oil
• 1/2 cup white wine
• 8 cups low-sodium chicken broth
• 2 bay leaves
• 1 onion, chopped
• 2/3 cup chopped carrots
• 1/3 cup chopped celery
• 1/2 cup chopped parsley
• 1 large sweet potato, peeled and diced
• 1 cup flour
• 1 egg, beaten
• 1 teaspoon olive oil
• 1 tablespoon plus one teaspoon orange zest