My birds favorite is a toss up between blueberries and cheerios. They go nuts for both of those.
My birds are totally spoiled and get a treat every night, usually stuff like lettuce, cabbage, honeydew, cantaloupe, tomatoes, watermelon, or blueberries, and a lot of times they end up getting our leftovers. I think spaghetti and rice are their favorites, but they haven't turned down anything yet except stuffing (which i found strange since they love bread), and yes I have fed them leftover chicken. They pick the bones clean.