I have 50g oats with 250ml water and stir half a thinly sliced banana in while it's cooking so that it 'dissolves' into the porridge. Just before it finishes cooking (which for me is about ten minutes because I like it thick) stir in a few tbsp plain yoghurt, then serve with a tiny bit of brown sugar, lots of nuts and dried dates.
Keeps me full for about five hours.