Muesli was introduced around 1900 by the Swiss physician Maximilian Bircher-Benner for patients in his hospital, where a diet rich in fresh fruit and vegetables was an essential part of therapy. It was inspired by a similar "strange dish" that he and his wife had been served on a hike in the Swiss Alps. Bircher-Benner himself referred to the dish simply as "d'Spys" (Swiss German for "the dish", in German "die Speise"). Muesli in its modern form became popular in western countries starting in the 1960s as part of increased interest in health food and vegetarian diets. Traditional muesli was eaten with orange juice and not milk.
These cereal bars take the traditional muesli mix, press them, then bake them, into a convenient "on-the-go" bar form. It is a very popular snack all over the world.