To make this Sausage Balls Recipe gluten free, replace the Bisquick with a certified gluten-free baking mix. Confirm that the sausage, cheddar cheese, milk, and any seasonings in the sausage are labeled gluten free. If using a gluten-free baking mix, check whether it already contains leavening and salt. Use clean bowls, utensils, and baking sheets to prevent cross-contact with gluten-containing ingredients.