Right, very simple and I promise you this works (I've made about 40g on it so far).
Buy 'Ice Cold Milk' from innkeeper in Ironforge for 1silver,
shift click it and make 5 piles of 1xIce Cold Milk,
put each 1 in ah for 1sbid, 25sBO
wait 1 hour
collect 1g.
rinse and repeat.
Like i said, I started off doing 5, and before i even flew to menethil harbor, they had all sold with people doiing the cookee and milk quest, so i went back and put about 50 ice cold milks in the ah, went to bed, work up and they were all sold. So, i kept doing it and kept doing it, and they kept selling. Damn ppl.... lol