What came first, the chicken or the egg? If you are going to put that off and try to work back to the first egg, what came first that egg of the creature that laid it.
"Eggs, generally speaking, existed before chickens did... Archaeopteryx fossils, which are the oldest generally accepted as birds, are around 150 million years old, which means that birds in general came after eggs in general."
But as an addendum:
"They say... the chicken. Researchers found that the formation of (chicken) egg shells relies on a protein found only in a chicken's ovaries"
So the answer is, drum roll: Both came first.