[header] How to know when cookies are done [title] Look for golden edges. [step] Cookies with lighter dough will change color as they cook. The centers may remain a soft golden hue, while the edges may turn more dark gold or light brown. 
Make sure to remove the cookies before the edges turn dark brown or they'll be burnt. [substeps] For example, you can test the doneness of peanut butter, oatmeal, and other drop cookies by using this method.