To make these Quick Maple Bars gluten free, replace the refrigerated biscuit dough with a gluten-free biscuit dough or gluten-free pastry dough that can be rolled or flattened and fried successfully. You should also confirm that the maple extract, confectioners sugar, light corn syrup, and any packaged ingredients are labeled gluten free, since formulations can vary by brand. If cross-contact is a concern, use a clean skillet, fresh oil, and utensils that have not been used with wheat-based dough. The glaze itself is generally easy to adapt once the dough is swapped.