What David left the cookies in the oven too long and they became charcoal.?

David accidentally left the cookies in the oven for too long, causing them to burn to a crisp and turn into charcoal. The initially sweet aroma was replaced by the unpleasant smell of smoke, filling the kitchen. Disappointed, he realized that he would need to start over and pay closer attention next time. It was a lesson learned in the importance of timing while baking.