I know the answer to this question!!! Bam !! A chicken (or hen ) and an egg are laying in bed. The chicken is leaning against the head board with a satisfied look on its face smoking a cigarette. The egg, looking a bit ticked off, rolls over, grabs the covers and says .. " well I guess we finally answered THAT question " :p
If you mean the chicken, or the chicken egg, the question is evolutionarily meaningless.
Populations evolve, individuals are selected. Think deeply about that and you will realize that there is no one point in chicken/egg transitioning.
Ok here we go! An egg most likely came first. But then it takes a Rooster and a Hen to make eggs so then by that the hen came first. But then again the hen had to be hatched in order to have the egg but without a Rooster the Hen couldn't become pregnant to have the egg. So then the egg came first, and this can go on for hours but who really cares in the long run?
The egg. Its the simplest form of life and it evolved to eventually become a hen.
The chicken came before the egg. In Genesis chapter 1:21 says; So God
created the great sea monsters and every living creature that moves,
with which the waters swarm, according to their kinds, and every winged
bird according to its kind.
Scientifically: The Egg
Biblically: The Chicken
Personally: The Road