On the last day of our trip to Disney World earlier this month, we had lunch at Backlot Express, a quick service restaurant at Disney's Hollywood Studios.
I mobile ordered our meal in the My Disney Experience app. If you do not see allergy-friendly options listed, click on "See All Categories" or keep scrolling to check for allergy-friendly choices. You can not mobile order if you have more than one food restriction, and not all quick service restaurants at Disney World have allergy-friendly options available for mobile order in the app. In the theme parks, you should be able to mobile order gluten free options at most quick service restaurants, but at the resorts, plan on talking to a manager or a chef. Talking to a manager is always an option at the theme parks. Just speak to the cast member guarding the door, and yes, cast members are literally guarding the doors to quick service restaurants during the pandemic. They want to make sure people do not enter restaurants until their food is ready, but I was allowed to enter restaurants when I needed to speak to a manager or chef before placing my order.