one needs to define chicken. a chicken is one which can mate and have kids with at least one chicken in existence. if you were to go back in time, there would be the first chicken capable of doing this. that chicken came in the form of an egg.
Well, if life came from cells, those cells made animals, and then the animals evolved gradually into chicken's ancestors, from which they laid eggs, therefore the egg came after the chicken in both Creation and Evolutionary theories. And on a side note, Science has "spoken" multiple times and almost if not every time they've been wrong about their own theory... #Creation
I accepted your definition of chicken, this is true. Is it not reasonable to say there must first be an animal in the same family as chicken, a chicken's ancestor, that must have been before the egg to lay the egg, so that the chicken family could exist? Lets break it down a bit. If, by your theory, life spotaneously just began, it did not come from an egg, since this first being would ultimately be the first chicken ancestor. This ancestor would have predated the egg by millions of years! It would also fit your definition entirely, because it had the ability to mate with other chicken ancestors, which was your only requirement of the chicken definition.
Also, if we come at this from a Creationist view point, we can see in the book of Genisis that God made the first chickens on the fith day of creation. He does not say that he created an egg, therefore, we can assume the chicken came first. Either way in either belief, the chicken had to have came first to create the egg. How can you have chicken offspring without a chicken being first?