Preheat the oven to 190°C/gas 5.
Place 12 large muffin cases into a muffin tray. In a large bowl, thoroughly combine both flours, oats, baking powder, cinnamon, and sugar. Add the grated apple and stir well to evenly distribute it throughout the mixture.
In a jug, combine the yoghurt, milk, egg, and oil. Pour this into the dry ingredients and add the sultanas. Mix lightly, stopping as soon as everything is just combined.
Spoon dessertspoonfuls of the mixture into the paper cases.
Bake for 25–30 minutes, or until the muffins are risen and golden brown. Transfer them to a wire rack to cool. Eat within 24 hours, or freeze them for later.
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