A new super cool ootaxon of eggs and very different that what we are familiar with is presented in this paper : Stillatuberoolithus storrsi from the Kaiparowits Fm of Utah.
Eggs are tiny at around 18mm and " the exact identity of the egg producer is unknown, the eggshell microstructure and small size is consistent with a small-bodied avian or non-avian theropod"
Paper:
https://www.nature.com/articles/s41598-021-89472-1#disqus_thread
@-Andy- @HamptonsDoc