How to safely paint plates?

Hii my sweet 16 is coming up and im planning a huge party, based off short n sweet by sabrina carpenter. Its not my usual music as i prefer punk and metal and deathcore, but shes really good, and i thoight it could be a fun way to celebrate the end of really being a proper kid. Anyways, i fpund these cute plastic plates in baby blue with scalloped edges and i want to paint a kiss mark on them. Is there any way to do this safely, or any food safe paints i could use? Any reccomendations would be greatly appricited, thank youuuu