Put the oatmeal in a bowl.
Pour the milk or plant-based alternative into the bowl as well.
Stir in the yoghurt.
Next, add the lemon juice.
Let your muesli swell for 5 minutes.
Finally, you can garnish your muesli with fruit or nuts of any kind.
If the muesli is not sweet enough for your taste, you can refine it with a little honey.