Microwave method: Add the oats, ground flax seeds and diary-free milk (or water/dairy-free milk mixture) to a microwave-proof dish. Place on a microwave-proof plate, cover and heat a full power for 1 minute. Stir, then cover again and heat for another 30 seconds. It is cooked when it is steaming and thickened. As all microwaves differ, you may need to cover and cook for a further 30 seconds.