If not serving waffles immediately, place them in a single layer on a wire rack and keep them warm in a 200 degree F oven for up to an hour. If you stack the waffles on top of eachother, they’ll get soggy. Store leftover waffles in the freezer for best results. Place them in a zip-top bag and freeze for up to 6 months. Reheat in a toaster or toaster oven.