These Ham and Cheese Egg Muffins are naturally gluten free, but it is still important to confirm that all packaged ingredients are certified gluten free. Check the diced ham, shredded cheddar cheese, minced garlic, and nonstick spray, as some brands may include additives or be processed in facilities where gluten cross-contact can occur. If you are preparing this recipe for someone with celiac disease or a strong gluten intolerance, make sure your muffin tin, mixing bowl, whisk, knife, storage container, and work surfaces are thoroughly cleaned before use.