Heat the oil in a pan,add the mustard seeds,cumin seeds and fry. Add the chopped onions and saute until they turn transculent.
Now add the chilli powder, amchur powder, chaat masala, coriander powder and salt and sauté for 2 to 3 minutes. Add finally the cooked channadal.
Cook until the mixture turns dry. Finally add the chopped coriander leaves.
Allow the mixture to cool completely and divide into small equal portions.
For assembling -
Mix the flour,baking soda, baking powder, oil, yogurt, sugar and salt in a bowl.
Add gradually the warm milk and turn everything as a soft but not a sticky dough, cover the bowl with a damp cloth and keep aside for half an hour.
Now flatten a portion of the dough, place enough channa dal filling in the centre.
Fold the dough to form a ball, dust the dough with flour and gently flatten them as round disc.
Heat few drops of oil, gently drop the flattened kulcha.
Cook on both sides until the kulchas turns golden brown.
Brush the hot kulchas with butter.