Very hit or miss at this shake shack with gluten free orders. I have never been given an order with gluten but the quality of the gluten free buns is a lottery. the last few times I have been, the buns were cold (not reheated or toasted) and crumbled. as someone being gluten free for a long time, either don't freeze the buns before serving them or double the time that you toast them. ideally, don't freeze them, toast them, and serve it hot with the burger