My current favourite overnight oats

We all have our favourite versions of muesli, or overnight oats, or whatever.  I do like my recipe for bircher muesli, but this version is my current favourite and is quicker to make.

1/2 cup muesli (we use Lidl's Deluxe version)

1 apple

Frozen fruit, to taste (raspberries, or berry mix)

1 cup oat milk or kefir.  Oat milk is nicer; kefir is probably better for you.  

Grate your apple into a bowl, then stir in the rest of the ingredients.  The fruit should thaw overnight in the fridge.  

It isn't very photogenic, so here is a pack of frozen fruit which might be in one of our freezers.  Or something similar.