@frank430316
Attended the Star Wars Dessert Party tonight (well, OK technically it was last night, but it's not the next day until you go to bed, so...)
I was able to speak to the CM at the flash frozen Nutella "truffles" station, and he assured me that it is indeed gluten-free. He also indicated that if you, or a member of your party has a food allergy, to be sure to let them know (both at the time of booking, and at the party) and they have a small supply of allergy-friendly substitutions available.
Additionally, a CM will walk all of the catering stations with you, and point out what is allergy-friendly for you, and what to avoid based on your food issue.
Hope this is helpful!