12 is only too many if you're also buying a single pint of milk, to make it completely clear that you live alone and will be eating all of them yourself.
It would be except that you're tearing a cookie-side off each Oreo and smashing them together for double-double stuffing (you did buy double-stuffed, right?) pre-milk, and saving the scrap sides to have with homemade dunkaroo dip later. So it's only half as many cookies as it looks like.