Oh, man… I was just looking at something about this today but can’t remember the website. Let me think…it was about chocolate chip cookies; if you want them chewy, you beat the heck out of the butter/sugar/egg, & chill the portioned-out dough on the cookie sheets so it’s cold before putting the cookie sheets into the preheated oven. For crispy, you just stir the sugar etc. so there’s not so much volume and I think put it right in the oven (heated). I think that’s how it was….good luck!