Chicken and Dumplings

Name: Chicken and Dumplings
Ingredients: 2 1/4 cups (255g) King Arthur Unbleached Self-R; 4 tablespoons (57g) butter cold cut into pats; 2 tablespoons (4g) chopped fresh chives or parsley or 2 teaspoons dried; or 2 teaspoons herbes de Provence all optional; 3/4 cup (170g) buttermilk or 1/2 cup (113g) plain yogurt thinned with 1/4 cup (57g) milk; 1 large egg; 4 tablespoons (57g) butter; 1/2 cup (57g) King Arthur Unbleached All-Purpose Flour (not self-rising); 3 cups (680g) chicken broth; 1 teaspoon dried thyme; 1 bay leaf; salt and pepper to taste; 1/4 teaspoon Worcestershire sauce; 4 cups (454g to 510g) diced cooked chicken; 2 1/2 cups (312g) frozen mixed vegetables thawed and/or cooked; or a mixture of cooked peas and carrots