Blueberry, Date & Oat Muffins with Yoghurt

I find that using sugar and dates together in this recipe provides the best depth of flavour. The yoghurt lightens the crumb a little and gives a small amount of sourness, which is enhanced by using the buttermilk or soured milk. Instead of the blueberries, feel free to use your favourite berries, such as raspberries or blackberries – or use a mixture of them all to make a summer berry muffin.