This Tater Tot Breakfast Casserole can be gluten free if you double check the ingredient labels.  Some ingredients you think are gluten free may not be.  The sausage doesn’t contain any gluten but not all manufacturers meet USDA standards for “gluten-free” because they are cross contaminated by either using shared equipment or by being made in the same facility as gluten grains.  Some sausages even contain rusk made from wheat.  Jimmy Dean Sausage is an example of sausage that is not gluten free.   You can check out this Gluten Free Sausage Brand list or double check the packaging to ensure your sausage is certified gluten free. The tater tots are another ingredient to look out for.  You would think they would all be gluten free, but some actually contain gluten!  Look for certified gluten free tater tots which should be easy to find and clearly labeled.