Hi Dianna, I would first consult our High-Altitude Baking Guide for tips on adjusting your cookie recipes for your altitude. Reducing the baking powder/soda, reducing the sugar, and increasing the baking temperature (along with reducing the baking time) might do much to eliminate spreading. You might also need to add a bit more flour and perhaps an additional egg. If those measures don't work, a little Instant Clearjel might also be helpful. 

• Reply