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Reese's Peanut Butter Cups are a brand of candy filled with peanut butter, and covered with Chocolate, marketed by The Hershey Company. They were created in 1928.

There are bigger versions of Reese's Peanut Butter Cups, too, the Reese's company also has special peanut-butter pumpkins for Halloween that look like Jack-O-Lanterns. 

Halloween Edition Reese's Peanut Butter Cups.