Preheat the oven to 180C/350F/gas mark 4
Use two 20cm/8 inch sandwich tins.
Line the base and grease the sandwich tins. Heat the carob chips or chopped carob bar in a saucepan with the butter, sugar and syrup until just melted. Sift the flour, carob powder and baking powder into a mixing bowl. Make a well in the centre and stir in the cooled melted ingredients. Stir in the sour cream and beat well, then mix in the milk. Pour the mixture into the prepared tins and bake in the preheated oven for 30 minutes or until set. Allow to cool in the tins for ten minutes before turning out on to a wire rack to cool completely.
