Oh Henry! is a chocolate bar containing peanuts, caramel, and fudge coated in chocolate. It was first introduced in 1920, by the Williamson Candy Company of Chicago, Illinois. According to legend, Oh Henry! was originally named after a boy who frequented the Williamson company, flirting with the girls who made the candy. The name is also said to be a homage to American writer, O. Henry. However, there is no definitive explanation as to the exact origin of the name.
Peanutty, Caramel & Fudge Bars in Milk Chocolate.