The diameter, thickness, and the relative proportion of its two major components vary according to the desires of the maker.

The most popular brand of peanut butter cup is the Reese's Peanut Butter Cups (sold as Reese in Canada), always featuring Hershey's chocolate,[3][4] and now a Hershey brand.

[3] The Reese's Peanut Butter Cup is considered the "finest creation" of Harry Burnett "H.

[3] Originally sold in bulk, sales of their individual "penny cups" began in 1941, in response to sugar rationing during WWII.

[8][5] Some have been one-time thematic variations, such as Reese's banana-flavored Elvis Special Edition in 2007.