The concept of “eggs” is way, way older than chickens. Fish lay eggs. So in this case, it’s definitly the egg that came first.
You can dig deeper, but eventually you end up on the what is an “chicken egg” and a “chicken” … which means you have to deal with taxonomy. And well, it’s just made up… so that doesn’t really lead anywhere.
The concept of “eggs” is way, way older than chickens. Fish lay eggs. So in this case, it’s definitly the egg that came first.
You can dig deeper, but eventually you end up on the what is an “chicken egg” and a “chicken” … which means you have to deal with taxonomy. And well, it’s just made up… so that doesn’t really lead anywhere.
So I say it’s the egg. final answer.
This is the only answer. Dinosaurs laid eggs long before they evolved into chickens.