Informal:
* Mon petit bonbon: This is the most direct translation and sounds very cute.
* Mon petit gélifié: This is a bit more literal, using the French word for "jelly."
* Mon petit chouchou: This translates to "my little favorite" and is a very affectionate way to say it.
Formal:
* Mon petit bonbon: This translation still works, but it sounds a bit more formal.
* Mon petit bijou: This translates to "my little jewel" and is a very elegant way to say it.
Other options:
* Mon petit trésor: This translates to "my little treasure" and is a very sweet and affectionate way to say it.
* Mon petit cœur: This translates to "my little heart" and is a very romantic way to say it.
Ultimately, the best way to say "my little jelly bean" in French depends on your relationship with the person you are talking to and the context of the situation.