If you expand the parameters of the question to allow the inclusion of sex cells (gametes), eg ova and sperm, then eggs beat chickens by, give or take, 1bn years. The uniformity and commonality of sex among distantly related modern-day groups, such as algae, plants and animals (then mostly little more than single-celled specks, hoovering detritus from rocks), suggests that eggs and sperm likely evolved at some time around 1bn years ago. This leads us to conclude that there were eggs and sperm on this planet long before animals as we know them today evolved. This was long, long, before egg tubes.
— Read on www.theguardian.com/science/article/2024/may/05/which-came-first-chicken-egg-evolution-science-zoology
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