The potato stuffing is prepared first and set aside.
For the stuffing, in a pan, heat oil and add cumin seeds and let them splutter.
Add the chopped onion and sauté for a couple of minutes until the onions are slightly cooked.
Add asafoetida, salt and turmeric and fry for a minute.
Add dry mango powder, chilli powder and garam masala.
Add the mashed potatoes and mix well and let this mixture cool down.
For the batter, mix bengal gram flour, salt and baking soda in a bowl. Add water little by little until it forms a smooth batter.
Slit the green chillies and remove the seeds and stuff them with the potato mixture.
Dip the stuffed chillies in the batter until they are nicely coated.
Heat oil for deep frying and gently add the batter coated chillies in it and fry them until they brown.
Remove from heat and serve with tamarind chutney and green chutney.