Can I sweeten my yoghurt? In order to sweeten your yoghurt, you can add sugar to your milk whilst heating.Or as an alternative, you can add jam or fruit to your finished yoghurt to create a sweetened fruit style yoghurt. Related articles Do I have to heat my Yoghurt Culture? Can I not just put it into milk? Can I use an EasiYo maker? How long can yoghurt be kept in the fridge? Why is my yoghurt not setting? How much milk to use for each sachet of yoghurt culture, can I reculture/reuse it?