There's nothing more deflating—literally—than pulling a tray of cookies out of the oven and seeing pancake-like puddles where thick, chewy rounds should be. We spoke to baking expert and cookbook ...

You pull a tray out of the oven, excited to see gooey chocolate chip cookies—and instead, you’re met with a batch of sad, flat puddles. Ugh. We’ve all been there. So what went wrong? Here are seven ...