To make this Corn Pudding Recipe (Nantucket Style) gluten free, replace the oyster crackers with certified gluten-free crackers or gluten-free breadcrumbs. Be sure to verify that all packaged ingredients, especially the crackers and shredded cheese, are certified gluten free and free from cross-contamination. The remaining ingredients are naturally gluten free, but labels should still be checked if needed for strict dietary requirements.