Which iconic candy brand was originally created as a way to use up excess chocolate during slow summer sales periods?

The history of candy brands reveals fascinating stories of innovation, perseverance, and sometimes pure accident. Many of today's most recognizable confectionery brands have origins dating back over a century, surviving wars, depressions, and changing consumer tastes. This trivia question explores an interesting pivot point in candy brand history that transformed a small company into a global phenomenon.

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M&M's (created in 1941 as military rations that wouldn't melt)
Kit Kat (created in 1935 as a worker's snack to accompany a cup of tea)
Reese's Peanut Butter Cups (created in 1928 by H.B. Reese to use surplus chocolate)
Toblerone (created in 1908 to mimic the Swiss Alps and attract tourists)