In a bowl, combine the sweet potatoes, oil, salt and pepper; toss to coat. Transfer to a 15x10x1-in baking pan coated with cooking spray. Roast at 425 degrees for 20-25 minutes or until tender, stirring once.
In a large bowl, combine the garbanzo beans and sweet potatoes. In a small bowl, whisk the dressing ingredients. Add to the sweet potato mixture, toss to coat. Serve over salad greens, top with cheese.