Preheat the oven to 220C/425F/Gas 7. Line a baking tray with greaseproof paper.
Stir all of the ingredients, except the yoghurt, together in a bowl. Add most of the yoghurt and mix together to a soft dough. Add a little extra yoghurt if the dough is dry.
Tip the dough out onto a floured work surface and knead for a few minutes until smooth.
Shape into round loaf and put on the baking tray. Flatten slightly with your hand then mark a deep X on the top using a knife. Make sure to cut almost all the way to the bottom of the dough, so that the middle of the bread cooks all the way through.