Heat the Oil:
Add 3 tablespoons of oil to a thick pan over medium heat.
Add the all whole seeds : mustard seeds, fennel seeds, kalonji, cumin seeds, and fenugreek seeds to the hot oil.
Let them pop for about 1 minute, until fragrant.
Add the chopped green chilies and finely chopped ginger.
Sauté on low flame until fragrant.
Add the sliced potatoes to the pan.
Mix well and sauté for a few minutes.
Add 1 teaspoon of salt and cover the pan.
Cook for 4 to 5 minutes until the potatoes are halfway done.
Drain the water from the eggplant slices and add them to the pan.
Stir well and cook on high heat for a few minutes.
Add the paprika or red chili powder and coriander powder.
Mix everything well.
Lower the heat and cook for an additional 10 minutes.
After 10 minutes lift the lids and check. If the mixture is too dry and the eggplant is not soft add a few tablespoons of water, cover, and continue cooking for 5 to 10 minutes.
Remove from heat and top with chaat masala and freshly chopped coriander.