This question has been asked many times before. Since the question is a paradox, there is no answer. If the chicken came first, it came from the egg. If the egg came first, then it came from a chicken, and so forth.Evolution suggests that both chickens and eggs evolved from creatures and "egg-things" you would not recognize to be part of the lineage. Similar to how, in the very distant past, some molecules that were]not what we would call "life" became "life".That was the beginning.
There is no correct answer that can be proven. It's all theory.