Heat a pan, add mustard oil then add bay leaves, cinnamon sticks, cardamon, stir for sometime, add sliced onions, onion paste, when it's becomes golden add ginger garlic paste, turmeric powder, red chilli powder, coriander powder, cumin powder, stir well, add tomato paste, then add the chicken, potato and stir it very well cook in a low flame, add salt, cook for some more time, add water as per gravy you want.. Cook well.. Serve hot