Firstly, bring the water and milk to the boil on the stove in a small saucepan. When small bubbles start to appear add your oats, then turn the heat down to the lowest and allow the oats to simmer for approximately 5 minutes.
Meanwhile, slice your banana roughly into half and put one half aside. Mash the other half completely into a puree and add to your oats whilst they cook. Stir the oats thoroughly, adding more liquid if it is sticking, and then add in the vanilla extract. When your oats have thickened up to your desired consistency, which is after about 4 or 5 minutes longer, pour into a bowl and top it with the other half of your banana, in slices, and your desired toppings.
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