What Type Of Matieral Cracks Just As Easy As Egg, But Isn’t Harmful?

To add some insight to my question above:

I’m having a party for Easter and would like to make a giant cascarone (confetti egg), but I’m having trouble finding a material that cracks just as easy as an eggshell and that isn’t harmful to use.

I was thinking of paper mache, but realized that wouldn’t be easy to crack. If you have any ideas please let me know!