In a mixing bowl, Mix gram flour, a pinch of teaspoon turmeric powder, ½ teaspoon red chilli powder and salt to taste. Add water and whisk it into a smooth and thick consistency batter.
Heat 1 & ½ tbsp. oil in a pan. Add mustard seeds. Once they start spluttering, add coriander leaves. Add the ginger and chopped chillies. Saute it for a minute.
Now add coriander powder and chaat masala, salt, red chilli powder, turmeric powder and mix it well. Add 2 tablespoons of water and add coarsely mashed potatoes.
Keep the potato filling aside and let it cool.
Make 8 equal sized balls of potato filling, now dip these balls and coat these balls into the gram flour batter we made.
Now drop these batter coated balls in the hot oil very carefully and fry them on medium-high heat. when they are golden brown from all side, with the help of a slotted spoon take them out of the pan onto a plate lined with a kitchen napkin.
Serve them hot with coriander mint chutney and spicy fried green chilli.