Disney says
Grant sweet wishes with pastry wands of fried dough coated in cinnamon, sugary goodness.
Friendliest.app says
All churro carts sell bottled beverages. If you are sensitive to any of the listed allergens, it is recommended that you purchase drinks from another location with less chance of cross contamination.

All Disney churros are purported to be produced by Tio Pepe's Churros, a J & J Snack Foods brand.

Allergy-friendly meals at Churros near Big Thunder Mountain Railroad