I have been out of town and just saw this. Just a word of warning to really watch the heat if you put them in the oven. I did that once in a 'cookie emergency' and got butter bleed.
I am with Julia on the dehydrator and have never had a problem with that. Another way that I have dried them is to place them in front of a fan blowing horizontally, but you cannot have high humidity, which sounds to be an issue. When I have done that, I have placed them in a room with good a.c. or with a dehumidifier.