Heat oil in a large skillet over medium-high heat. Add roast; cook 8 minutes or until browned on all sides.
Transfer roast to a 5- to 7-quart slow cooker. Rub roast with garlic, parsley, chives, thyme, salt and pepper. Add broth. Cover and cook on Low 5 hours. Add potatoes, carrots and celery. Cover and cook 2 hours or until vegetables are tender.