I am baking oatmeal cookies from a recipe. The cookies are always
puffy when then come out of the oven but then lose their puffiness and
flatten out while air cooling on the cookie sheet. What causes the
cookies to go flat and how can I remedy the problem? I want them to
stay puffy and robust.

Altitude is not the problem. I am only 300 - 500 feel above sea
level.

The recipe does not call for baking powder.

Thanks

Tim

Tim,
What kind of shortening are you using?
Crisco will help them stay full and soft but if you use butter they will
flatten and get crisp.

D.L.