To make this Slow Cooker Creamy Cheddar Corn gluten free, confirm that the cream cheese, heavy cream, butter, and seasonings are labeled gluten free, as ingredient formulations can vary by brand. Frozen corn is often naturally gluten free, but it is still a good idea to check the packaging for any additives or cross-contact warnings. If you are serving this dish as part of a larger meal, be sure the accompanying dishes are also gluten free to avoid cross-contamination.