To a high-speed blender add the ice, milk or half and half, instant coffee mixture, caramel syrup, xanthan gum, and granulated sugar. I would start with ½ tablespoon then add more if needed.
½ cup half and half, 1 cup crushed ice, 2 tablespoon caramel syrup, ¼ teaspoon xanthan gum, ½-1 tablespoon granulated sugar