In a heavy-based saucepan, start to heat the milk and water. Add the butter, xylitol, cinnamon, gelatine, and salt and stir to start to dissolve everything
While the milk mixture starts to heat up, put all the other ingredients into a bowl and mix until a well-mixed batter
Once the milk mixture is just about to boil, remove it from the heat and gradually pour in the batter mixture and immediately start whisking everything together
Put the saucepan back on the heat, turning it down a notch to make sure it doesn’t start to boil. Aim for a gentle simmer and stir constantly
Allow it to cook whilst whisking regularly for about 5 minutes or until it starts to thicken up
You can either enjoy it immediately or if you’re making it in advance, some time in the fridge gets it to that traditional oaty texture