I decided that the easiest way to make sure our cookies are peanut-free is to make them myself from scratch. I bought chocolate chips from a peanut-free facility and vanilla extract from McCormick, which is supposed to be peanut-free.
Well, do I need to worry about the flour? I just found out that Clabber Girl baking powder is made at a nut-free facility, (I never would have thought to check the baking powder!) so maybe I do need to check where my flour was made?