Spices including mustard seeds, jeera/cumin seeds, red chili powder, dry mango powder/amchur, dry coriander powder/ dhaniya, turmeric powder and saunf
Heat oil in a pan, crackle mustard seeds, jeera and green chilies. Now add soaked urad- chana dal and mix well.
Add chopped onions and fry until they turn golden pink in color. Once the onions have changed the color, add boiled mashed potatoes. Now add spices and mix it properly. Add chopped coriander leaves and allow it to cool.
Make small balls out of the mixture and flatten them as a patties and keep aside.