To make these Classic Buttermilk Bar Donuts gluten-free. Substitute the cake flour. With a high-quality gluten-free all-purpose flour blend. Ensure that the blend contains xanthan gum. Or another binding agent. To help mimic the structure that gluten provides. Additionally, double-check all other ingredients. Such as baking powder, powdered sugar, and vanilla extract. To ensure they are certified gluten-free. As cross-contamination can sometimes occur during processing. The texture of the donuts may be slightly different. But they will still be deliciously tender and flavorful. Making them perfect. For everyone to enjoy!