Place the kale in a large bowl. Add half of the apple, all of the celery, ¼ cup cashews, and ¼ cup raisins.
Put the remaining apple in a blender or food processor along with the remaining ¼ cup cashews, 2 tablespoons raisins, yogurt, Dijon, maple syrup, 2 tablespoons water, vinegar, salt and pepper. Puree until well combined and slightly thick, adding an extra tablespoon or so of water if needed.
Pour the dressing over the kale and toss to distribute. Sprinkle the sunflower seeds and feta cheese over the top. Serve and enjoy!