First Dough: Sieve flour with salt. Add yogurt, milk, sugar and sufficient water. Knead well into a medium soft dough. Apply a little desi ghee and knead it further. Keep it under wet cloth for one hour. Knead the dough once again and divide the dough into eight equal portions.
Second Dough: Sieve refined flour with salt. Rub in butter till it becomes crumbly. Gradually mix in the milk and knead to make a soft and smooth dough. Cover with a damp cloth and rest the dough for ten minutes. Knead the dough once again and divide the dough into eight equal portions and form them into smooth balls. Cover with the damp cloth and rest for another ten minutes.
Stuffing: Mix potatoes, onion, salt, green chillies, red chilli powder, cumin powder, anardana and coriander leaves. Mix with hands.Divide the potato mixture into eight equal portions and keep aside.Flatten a portion of the first dough, place a portion of the potato mixture in the centre and fold the dough over to form a ball. Flatten a portion of the second dough and place the stuffed ball in the centre and fold to form a ball. Place this on a lightly floured surface and roll gently into a disc.
Rub a wet hand on one side of the kulcha, gently stick the dampened side to the inner wall of the pre heated tandoor. Take care to apply enough water while sticking the kulcha. Then wait for two to three minutes till the kulcha color converts to brown. After Waiting gently dislodge the kulcha from the tandoor wall.
Brush the hot kulcha with butter and serve immediately.