They have always existed - At least that is what Aristotle has to say: "If there has been a first man he must have been born without father or mother – which is repugnant to nature. For there could not have been a first egg to give a beginning to birds, or there should have been a first bird which gave a beginning to eggs; for a bird comes from an egg."
I went to the natural history museum and saw a t-rex with a creme egg wrapper right by its feet. This must be conclusive evidence to state that the cream egg came before the chicken. There are no chickens at natural history museum just old stuff like dinosaurs and cream eggs
It has to be the creme egg that came first because look at the size of the creme egg and creme chicken. The creme egg is bigger than the whole creme chicken ! How could the chicken lay an egg bigger than its self?