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Put the apples in a pan with 100ml water and cook gently until almost softened. Turn up the heat. Add the cranberries, mixed spice and 3 tbsp of the caster or granulated sugar and bubble until saucy. You can make this a day before serving.
Tip the oats, milk, vanilla and remaining sugar into a big saucepan. Bring to the boil, stirring constantly, and simmer for 4-5 mins until creamy. Divide between 6 bowls and top with the warm or cold fruit mixture.