Heat some oil in a pan and sauté onion, green chillies, ginger and curry leaves. When it is done, add crab meat and salt. Keep on a low flame for 2 to 3 minutes and remove from fire. Add the smashed potatoes and egg yolk. Mix well. Make small balls from the mixture and shape it into cutlets.
Beat egg white. Dip each cutlets in the egg and coat it with bread crumbs. Fry them in oil till golden brown.