To make this focaccia gluten-free. Simply substitute the all-purpose flour. With a gluten-free flour blend. Look for one that contains xanthan gum. Which helps mimic the structure of gluten. You may also need to increase the olive oil slightly. To add more moisture. As gluten-free flours. Can sometimes result. In a drier dough. With these easy swaps. You'll still get the same deliciously crisp crust. And soft, fluffy interior. Without the gluten!