In a mixing bowl, mash boiled potatoes.
Add salt to taste, chaat masala, red chilli powder, black salt, dry mango (amchur) powder and finely chopped coriander.
Mix everything well together.
Fill the stuffing in slit green chillies.
Prepare besan batter (For Coating) -
In a mixing bowl add besan (gram flour), rice flour, turmeric powder, coriander powder, dry mango (amchur) powder, salt to taste, asafetida, red chilli powder. Mix everything well together.
Add curd and mix well.
Add water as required to give thick yet flowing consistency.
Add fruit salt and a Tsp of water.
Mix gently.