The egg of course, because there has to be an egg to make a baby, you need 2 animals to make more eggs. So how did 2 chickens randomly appear out of no where? so the answer must be the egg.
It is whatever you say before the other one. If I say "the chicken or the egg?", I said the egg first, so its the chicken. If I say which came first " the egg or the chicken?", I said the egg first, so it is the egg.
Evolution made the egg.. In my opinion.. then after that it hatched.. after a while another egg came and so on, and they just kept coming. Not a very supported opinion but its just a short one x]
i personally think, that turkeys came first, its egg at least, and then, its egg got mixed up with a family of sparrows, so the baby and the sparrow did the nasty, and it made a chicken egg... :P