Stir in flour, cook briefly, then add thyme, bay leaf, and chicken broth. Simmer until vegetables are tender, then add chicken, parsley, and lemon juice. Season with salt and pepper.
Mix dry ingredients for dumplings; combine wet ingredients and fold into dry. Adjust with buttermilk for moist dough.
Drop spoonfuls of dough into simmering soup, cover, and cook for 18-20 minutes until dumplings are firm.
Garnish with parsley or thyme and serve hot.
Notes
Ensure not to over-mix the dumpling dough to keep them light and fluffy.