To make this recipe gluten-free, use a certified gluten-free 9-inch pie crust.
Replace the all-purpose flour with a gluten-free all-purpose flour blend.
Confirm that the yellow cornmeal is certified gluten-free, as some brands may be processed with wheat products.
Check the powdered sugar, butter, and all packaged ingredients for gluten-containing additives or cross-contamination.
Use clean mixing bowls, measuring tools, utensils, and baking surfaces to prevent cross-contamination.