To prepare German Rock Date Cookies gluten-free, substitute the all-purpose flour with a 1:1 certified gluten-free flour blend that contains xanthan gum. If the blend does not include xanthan gum, add ½ teaspoon to improve structure. Because gluten-free flour may absorb moisture differently, consider adding 1–2 teaspoons of milk or water if the dough becomes excessively thick. Ensure all other ingredients—particularly the baking soda and spices—are certified gluten-free to avoid cross-contamination.