Disney says
Served on an Allergy-Friendly Bun with a Cuties® Mandarin and Applesauce with choice of Small Lowfat Milk or Small DASANI® Water. Meets Disney Nutrition Guidelines for Complete Meals without substitutions.
Friendliest.app says
The hamburger is served on an allergy-friendly bun that is free of gluten/wheat, milk/dairy, fish, shellfish, peanuts, tree nuts and soy.

This meal contains eggs (allergy-friendly bun). It contains milk when ordered with milk.

If ordered with a standard bun, this meal is egg-friendly, but contains other allergens.