If you plan on keeping your pizzelles crisp to the maximum possible extent, you can simply wrap your cookies in aluminum foil. Then, once they have cooled down to a significant extent, simply position them inside a tight bag or container for ensuring their crispness. Another way to keep your pizzelles crisp is by eliminating the use of baking powder. Since baking powder has the tendency to make your cookies fluffier and thicker, leaving it out implies that your treatment can remain crisp for a longer duration of time.