Mix the yoghurt with the flour, baking powder and salt. I prefer to use gloves for this, as it can get quite sticky. Knead it is mixed into a solid ball. Then divide into 4 equal pieces, and roll these into balls again
Make your herb oil by mixing olive oil, garlic powder and dried coriander.
And now for the magic: lay out a sheet of baking paper and fold it double. Fold it open again and cover it in lightly in herb oil. Place a ball of dough, fold it in the baking paper and flatten the dough using a rolling pen. Do this for all four balls, adding new oil as you go.
Bring a frying pan to high heat. Add the naans to the pan (I usually do it 2 by 2), and heat them for a few minutes per side, until they start to brown.