To make these Broccoli Cheddar Stuffed Potatoes gluten free, confirm that the Greek yogurt, buttermilk, Colby jack cheese, butter, and seasonings are certified gluten free or labeled gluten free. Use plain cooked broccoli without gluten-containing sauces or additives. Check dried onion flakes, paprika, garlic powder, onion powder, dill, and chives for cross-contamination warnings. Potatoes are naturally gluten free, but all packaged ingredients should be reviewed carefully.