Harold Oswin, an employee of William Neilson, developed "Crispy Crunch" in 1930.

Williams Neilson management made the decision to flatten the bar to the shape that it is today.

Crispy Crunches were sold in the United States for a brief time in the 1990s by the food distribution arm of Pro Set, the collectible card company.

[4] Pro Set went bankrupt, resulting in Crispy Crunch no longer being available in the United States.

Since Cadbury began manufacturing of the chocolate bar, the recipe has changed in that it is less salty and more sweet as it has more of the crunchy topaz-coloured candy coating around the centre.