What's the plural form of Bircher muesli? Here's the word you're looking for.
Answer
The noun Bircher muesli can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be Bircher muesli.
However, in more specific contexts, the plural form can also be Bircher mueslis e.g. in reference to various types of Bircher mueslis
or a collection of Bircher mueslis.