Turkey With Dumplings

Name: Turkey With Dumplings
Ingredients: 1 small yellow onion, chopped; 2 teaspoons baking soda; 4 cups raw, cooked or frozen chopped vegetables; Salt and ground black pepper to taste; 1 1/2 cups buttermilk; 2 cups 365 Everyday Value Organic Low Sodium Chicken Broth; 3 cups (about 18 ounces) shredded cooked turkey; 1 tablespoon 365 Everyday Value Extra Virgin Olive Oil; 1 cup mashed sweet potatoes (or a 3/4-pound sweet potato, cooked and mashed); 1 1/2 cups 365 Everyday Value Unbleached All-Purpose Flour, divided