I can't find anything good online to cook for pku kid, so any suggestions?

Low protein. A person with pku is unable to handle phenylalanine, a component of proteins. As such, any diet needs to restrict the amount of protein. Several sites appear to be available on-line; here is one: http://www.Ehow.Com/how_2047875_follow-pku-diet.Html. I would also suggest working withe a nutritionist for guidance.