Sky Bar

Arguably the least celebrated entry on our list, the Sky Bar was introduced way back in 1938. The concept behind it was a bit more sophisticated than most of its predecessors. Each Sky Bar has four separate sections, each of which contained a different filling: fudge, caramel, peanut, or vanilla. It was then covered in milk chocolate and wrapped up. The Sky Bar was the first chocolate bar that had more than one filling. Though it is still produced by its originator (Necco), the Sky Bar has grown increasingly hard to find in recent years. Some online candy stores sell them by the box.