It's been bugging me because I can't find anything on this animated series I vaguely remember from when I was a kid.

It was a stop -motion cartoon about a group of presumably school children whom investigated the paranormal and hunted monsters.

I remember the main character was probably a girl and there was one boy in the group whom could shape-shift into almost anything (like a superpower).

It was somewhat similar to "Mona the Vampire" but a different show entirely. The group worked like a business and I remember the girl would answer the phone with the line "If you gotta spirit, we wanna hear it!".

The only episode I remember with any clarity was when the kids were in a convenience store fighting a monster made of junk food, and they beat it by throwing an apple into it's mouth.

I you know anything it would be appreciated. Thanks :)