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Here is the original Toll House cookie recipe
Butter will also give a better result in these cookies than margarine or shortening. Whipped butter, diet butter/margarine, etc. will not work since they contain water. Butter melts at lower temperature and alllows the cookies to spread making them thinner and crisper.
Make sure all ingredients are at room temperature before beginning. That also allows them to spread faster when they hit the oven.
You alos want to make sure your oven temperature is accurate. If it is too high they cookies won't spread as well. Longer cooking at a slightly lower temperature will allow for crisper cookies.
You can try each of the above suggestions one at a time until you reach the consistency you want.
Good luck and happy tasting!
All the best,