Maximilian Bircher-Benner, inventor of muesliSwiss doctor Maximilian Bircher-Benner invented muesli at his health clinic . He called it the “apple diet dish”. The name muesli appeared later and is derived from an old German word for “puree”. His method called for combining a small amount of oat flakes and water with 3-4 chopped apples, lemon juice, condensed milk or cream, honey and chopped nuts.