I'm so glad I saw this. I made cookies the other day for classroom parties and they all came out super flat.

One of the recipes said to chill the dough before baking for an hour to prevent this, so I did, but they still were flat.
I also know that I haven't bought baking powder in a looong time, and probably the same with the baking soda. I'm going to get new stuff and try the recipes again and see if that makes a difference....thanks for the tips.