Mix the bran with the milk in a bowl and let it soak for about 5-10 minutes. Mix the flour, baking powder and raisins together. Beat the egg and add with the sugar, oil, peanut butter and the natural yoghurt. Mix everything well. Pour the dough into the prepared molds.
Bake at 180 ° C in a preheated oven for about 20-25 minutes.