To make this recipe gluten free, confirm that the ranch seasoning mix, bacon, sour cream, frozen hash browns, and shredded cheddar cheese are certified gluten free or free from cross-contact concerns, as some packaged brands may contain additives or hidden gluten. If needed, replace the ranch seasoning packet with a homemade gluten-free ranch seasoning blend. Also be sure to use clean utensils, bowls, and baking dishes if preparing the casserole in a shared kitchen.