My mother would make her own naan bread, leaving the dough to rise in the airing cupboard - covered with her least-loved tea towel. They tasted as good as the ones you find in downtown Delhi.
Sift the flour, salt, and baking powder into a bowl and stir in the yeast and sugar. Rub the butter in with your fingertips until the mixture resembles coarse crumbs.
Combine the milk and yoghurt in a jug and gradually add to the flour. Using your hands, bring everything together into a soft dough. Turn out onto a floured surface and knead until smooth.