Combine the first 4 ingredients in a large bowl; toss gently to coat. Arrange sweet potato slices in a single layer on a large baking sheet coated with cooking spray. Bake at 400° for 30 minutes or until tender, turning the potato slices after 15 minutes.
Combine parsley, orange rind, and garlic in a small bowl; stir well. Sprinkle parsley mixture over sweet potato slices.