Place the oats and apple juice in a large jar or container with a lid. Put the lid on and seal tightly. Shake until well combined. Place in the fridge and leave for 1 hour or overnight until all the juice has been absorbed and the mixture is a bit gloopy.
Grate the apple (throw away the apple core). Add the grated apple and yoghurt to the oat mixture. Now say “voila” (pronounced vwa-la) because you have made bircher muesli.
Divide the muesli among serving bowls. Top with berries and drizzle with honey. Now dig in!