To make these S’More Granola Bars gluten free, replace the all-purpose flour with a certified gluten-free 1:1 flour blend, use certified gluten-free rolled oats, and substitute the graham cracker crumbs with certified gluten-free graham-style crumbs or gluten-free digestive-style biscuits. Also confirm that the chocolate chips, marshmallows, and any syrup used are certified gluten free or free from hidden gluten-containing additives if needed for strict dietary requirements.