Olé Mexican Foods Corn Tostadas are going to become a cupboard mainstay very fast! Not only are our crispy tostadas free of gluten, but they also include no added sugar, have no cholesterol, and only 160 calories per serving. You may top them with any protein or veggie and your preferred toppings, or you can eat them as a snack with some spread! When ready to eat, simply place it in the oven or toaster for a minute or two to reheat.