How long can these brownie-like cookies keep?
I make these every year for my husband's staff meeting along with a number of other cookies. I have kept them for over a week in a tin. Instead of the chocolate chips I have used chopped hazelnuts in the cookies on occasion. You really do need a stand mixer to make them because the eggs do have to beat for 15 minutes.
personnaly, I think they might keep a long time, since they seem to be mostly chocolate.
I make a dozen diffferent cookies every Chistmas, every type from rainbow to pignolia meringue, and ship them to my family all over the country. So I have to start making them at least 2 weeks before Christmas. I put them in airtight tins or tupperware, and keep them in the garage as much as possible: the ones I keep for myself are still good for New Years. I also helped a friend make thousands of butter cookies once (for retail purposes), and I think he made them in November sometime. He said he always did it that way and they were fine! He just kept them in the storage room, which was sort of coolish.