This is a prop chocolate bar from Charlie and the Chocolate Factory. There are several kinds seen in the film. The Whipple-Scrumptious Fudgemallow Delight is Charlie's bar of choice and is the one he is seen opening 3 times in the movie. Third time proves lucky and he finds the Golden Ticket.
It consists of a molded plastic chocolate bar imprinted with the Wonka logo on each piece and wrapped in paper backed foil and a paper sleeve.