Marinate the prawns in chilly powder, turmeric powder and salt. Fry it in oil and slice it into small pieces.
Cook the potatoes, peel and mash it well.
Mix in ¼ cups of bread crumbs, prawns, onion, curry leaves, green chilly, salt, 1/2tsp chilly powder and a pinch of turmeric powder and knead all the ingredients well.
Make small patties out of it and dip it in egg whites and cover it in bread crumbs.