1Spray 5- to 6-quart slow cooker with cooking spray. In slow cooker, mix carrots, parsnips and onions. Top with sweet potatoes.
2In small bowl, mix honey, oil, 2 teaspoons of the thyme, the salt and pepper. Pour over vegetables; stir to coat.
3Cover; cook on Low heat setting 4 to 5 hours or until vegetables are tender. Just before serving, add vinegar; stir gently. Sprinkle with the remaining 3 teaspoons thyme.