Leftover Turkey & Dumplings Soup

Ingredients

• 8 cups lower-sodium chicken broth
• 4 cups turkey, cooked and shredded
• 1 cup sweet onion, chopped
• 1 cup carrots, chopped
• 1 cup celery, chopped
• 1 tablespoon garlic, minced
• 1 tablespoon dried thyme
• 1/4 cup water
• 1/4 cup cornstarch
• 3/4 teaspoon kosher salt
• 1 1/2 cups self-rising flour
• 1/4 teaspoon black pepper
• 3/4 cup buttermilk
• 1 large egg
• 2 tablespoons unsalted butter, melted
• fresh flat-leaf parsley, optional, to taste, chopped, for garnish