bubbles are from over mixing and from the oven not being hot enough.
To fix after baking just flatten with a large smooth spatula immediately when you pull from oven. They are still slightly moldable then. Be careful so as not to tear the cookie.
Next time preheat at least a 1/2 and try not to over mix the dough...
Good luck and great try.
Julia
yes..........you definitely have to preheat for a half hour or so before popping the cookies in.....when mixing make sure to really cream the butter and sugar in very well and everything else mix as little as possible.....just until the ingredients are combined, that should help avoid excess air in the dough
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