In a skillet over medium heat, saute the beef in the oil for 5 minutes, or until browned. Stir in the salt, pepper and garlic powder and place seasoned meat in a slow cooker. Add a little water to the skillet and stir to pick up the browned bits. Add to the slow cooker.

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Add the broth, water, celery, carrots, green onions, parsley and barley. Cover and cook on low setting for 6 to 8 hours, or until the vegetables and barley are tender. Add the thyme just before serving.