Tokimeki Tonight

The story is about a girl who has a vampire father and a werewolf mother. Despite her "Addams Family" home life, she just wants to live like a normal girl. Unfortunately, she is "blessed" with the unfortunate power to turn into anything she bites. Example: she accidentally bites a cake the wrong way, and she'll turn into a cake. Mix school yard romance into all that--she has a crush on the cute guy in school, and she has to deal with a prissy love rival without exposing her supernatural powers--and you've got a great manga.