A lot of time I'll make a certain kind of cookie that comes out crisp after cooling but then when I store it, just in an airtight container, they get soft. Am I storing it wrong? Also, I have an oatmeal cookie recipe that I followed to the letter and they are supposed to be "very crispy" and they came out kind of puffy and never got crisp. Some cookies just aren't good unless they're crisp, in my opinion. Is there a storing method I don't know about?