You would either need to be staying at, or dining at grand floridian, Or dining at Cinderellas Royal table in order to have the slipper dessert. If you are dining or staying at Grand Floridian you would call them, and asked to be transferred to private dining where you can order the slipper for the time you plan on dining at the resort, or if staying there. You would call MK private dining for the slipper dessert, or Cinderellas Royal Table in order to order it there. Those are the only 2 places that does the slipper.