Oh! For safe foods at the Olive Garden, anyway, their gluten free pasta might be the best choice - it is prepackaged and not made there. They just heat it up, so as long as you make sure they don't touch it with contaminated hands, that might do for you. A conscientious Olive Garden manager has said to me before that he didn't consider any other gluten free choice of theirs actually safe for someone who needed truly gluten free (rather than just 'very little gluten'). Too much chance of cross-contamination.
Have you spoken to any managers at the restaurants? Often if you do, and make it clear just what is needed to avoid getting ill, they can tell you if it can be done, or what they have that would work for you. Many times, the manager took it upon themselves to oversee our food prep to make sure it was truly free of gluten.