Take a pressure cooker and slightly warm the oil in it.
Add the potatoes and stir it once. Add rest of the ingredients, except coriander leaves and let it cook till 2-3 whistles.
Don't let it turn mushy, just cooked. Use judgement while adding the chilies.
Once the pressure cooker is cool enough, open it and add the chopped coriander leaves.
Serve with luchis or parathas or rotis.