That is so cute, and so useful! In fact, I may try it just for fun as I know a very small someone who could use it and her mother has given us eggs!
Egg-cellent Pattern I used:
Adult:
https://hearthookhome.com/an-egg-cellent-apron-free-crochet-pattern/
Child-size:
https://hearthookhome.com/egg-cellent-child-size-apron/