How can you tell when snickerdoodles are done baking?
Snickerdoodles will puff up towards the end of their bake time. When they've been puffed for a few minutes or are starting to come down, they're done. Take them out of the oven promptly for soft, chewy cookies (they'll seem like they're not done, but will continue to set as they cool), or cook them for a minute or two longer for crispy cookies.