Making your own peanut butter cups requires only three ingredients — chocolate, peanut butter, and powdered sugar. In fact, it was Reese's dark chocolate thins that claimed victory in our ranking of 11 Reese's peanut butter cups flavors. Now, all conventional wisdom dictates that Reese's makes the very best OG peanut butter cups (they actually came in at number two in our ranking of 11 popular peanut butter cups, but that was only because the winner was a tad sweeter). The dark chocolate somehow transformed the candy into a lighter treat, likely because its depth offset the creaminess of the peanut butter. Meanwhile, the classic Reese's peanut butter cups came in at number three because their slightly coarse and salty interior melded well with the creaminess of the milk chocolate coating.