Chocolate Balsamic Biscuits

1 cup plain flour
1/2 tsp bicarb soda
1/8 tsp salt
75g butter
1/3 cup cocoa
2/3 cup white sugar
1/3 cup brown sugar
1/3 cup yoghurt
1 tsp vanilla
1/2 tsp balsamic vinegar

Preheat oven to 180 degrees C. Cover two biscuit trays with non-stick baking paper.

Mix the flour, bicarb soda and salt together. Melt the butter in a saucepan, when melted take it off the heat and add sugars and cocoa. Mix well and then add yoghurt, vanilla and balsamic vinegar. Finally mix with the flour mixture and stir until just combined.

Drop tablespoons of the mix onto the trays, leaving room for spreading. Sprinkle lightly with vanilla sugar if desired. Cook for 11 minutes. They will be soft at this stage, but will firm up on cooling.