To make this recipe gluten-free, substitute the regular baking mix with a gluten-free all-purpose baking mix or a gluten-free Bisquick mix, readily available in most grocery stores. Ensure the pork sausage used does not contain any hidden gluten fillers or additives by reviewing the product label. Additionally, confirm that the shredded cheddar cheese is gluten-free, though most plain cheeses typically are. Follow the recipe as directed after making these substitutions.