Bring the milk, water, salt and oat flakes to the boil in a pan, simmer on a low heat for approx. 5 mins., stirring occasionally. Add the chocolate powder.
Simmer the blueberries in the water for approx. 2 mins. until a small amount of juice is produced.
Serve the porridge in bowls, top with the yoghurt, blueberries and chocolate shavings.