Boil the potatoes till they are slightly soft (al dente). Scoop out from the centre of the potatoes and keep it aside.
Make a batter with the besan, salt, turmeric powder, red chili powder and required quantity of water. Keep aside.
To prepare the filling, heat oil and temper with cumin seeds. Saute for a few seconds. Add the onion, ginger, garlic and green chilies.
Fry till they turn slightly brown in colour. Now add the scooped potato and all the dry spices. Mix well and saute for 1-2 minutes. Switch off the flame and keep aside to cool down.
Fill the potatoes with little of the prepared stuffing. Dip in the batter to coat well. Heat oil and gently slide the stuffed potatoes in it.
Fry on a medium flame till golden in colour on all sides. Drain on a kitchen towel and serve them as a tea time snack or as appetizers with some chutney.