A child would need to eat 9,000 cookies in a day to approach harmful levels of pesticide or naturally occurring heavy metals.

It's a recipe you can test for yourself — though ... "You can almost spread it, like on bread," said study author Emilia Di Lorenzo from the University of Naples Federico II.

Their final recipe involves transferring eggs in a steamer ... "You can almost spread it, like on bread," said study author Emilia Di Lorenzo from the University of Naples Federico II.