about your "chocolate crackles"..is this a thin, wafery type cookie?
b/c i think shortening makes cookies more light and chewy, rather than crispy. i recently made a cookie only using oil, according to a recipe, and they turned out to be inedibly crispy....but if they were thin enough, they may have been ok.
or, i may have been an idiot and cooked em too long! lol. whoopsie.