Put the porridge into a suitable pan and add the cinnamon. Mix together well before adding the oaty milk. If time allows, soak for about 15-20 minutes.
Turn the heat on and cook over low heat for 12 minutes. It should be creamy - add a little more milk, if needed. Turn off the flame, give it a stir, then put a lid on and rest for a few minutes.
Spoon the porridge into two bowls, add two plum halves (together with the cooking syrup) per bowl, then scatter the nuts and berries on top. Add a dollop of vanilla yoghurt, if liked.