Pretty sure they have 2 styles of ice cream sandwiches:
- Macaron Sandwich - these are pre-made and only available in chocolate and 1 to 2 other seasonal options.
- Pressed Brioche Sandwich - these are made to order and you can choose your ice cream flavor as well as sauce to go with it
I've done the Brioche sandwich a few times and love them ... it's a pretty unique offering for WDW