I believe it's bite-sized.
Going by the Merriam-Webster site, wither way is correct: http://www.merriam-webster.com/dictionary/bite-size?show=0&t=1297094565
Bite sized means exactly what it sounds like, that something is small enough to eat in a single bite. This would be a way to describe an appetizer or other small treat.
Bite Sized - 2013 was released on: USA: 24 February 2013 (internet)
The cast of Bite Sized - 2013 includes: Lindsay Fishkin as Lindsay Lexi Pappas as Lexi (2013)
In bite sized pieces
Bite Sized - 2013 The Jerk 1-3 was released on: USA: 24 March 2013
The New Adventures of Batman - 1977 Bite-Sized - 1.7 was released on: USA: 1977
Bite Sized - 2013 Spicy Tacos 1-1 was released on: USA: 24 February 2013
The Thrills Bite Size was created in 2001.
Fun size is basically 2 bite size added together.
m n m's