I think that coopers sells some extract that require just adding some sugar and putting in in the fermenter. I made one a few years ago. It wasn't very good, to be honest. But it was very easy to do.
I'd suggest buying something a little better, like a Brewer's Best kit. They have all of the ingredients, and great instructions. They do require a boil of about 2 gallons, though. I've been happy with those kits, if they are fresh.