What Causes A Cookie To Be Crispy?
A cookie is crispy because of the amount of water in it. When a cookie is baked, the water in the dough evaporates and causes the cookie to dry out. The longer the cookie is baked and the hotter the temperature, the drier and crispier it becomes. Additionally, the type of fat used in the cookie dough can also affect its crispiness. Butter or shortening tend to result in a crisper cookie than liquid oils.