To create a gluten-free version of this Cream of Crab Soup, replace the all-purpose flour with a gluten-free all-purpose blend or cornstarch. If using cornstarch, create a slurry by mixing 2 tablespoons of cornstarch with 2 tablespoons of cold water before adding it to the soup. Ensure the Old Bay seasoning and sherry are certified gluten-free, as some brands may include gluten-containing additives. Follow the remaining instructions as directed for a delicious gluten-free alternative.