1.Fill a slow cooker with broth, 8 oz water, garlic, herbs and pepper. Add chicken, peas and barley, then layer onion, potatoes and carrots overtop. Liquid should just cover vegetables. Do not stir.
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2.Allow to simmer overnight, at least 4 to 6 hours. Remove bay leaves and stir before serving. Spoon 1 cup into each bowl and top with 1 tbsp sour cream, if desired.