Prepare dosa mix as per the instructions on the packet. Add salt and asafoetida to the batter. Oil the griddle (on medium flame) and pour a ladle of the batter. As soon as the dosa is half cooked, pour some egg mixture. Sprinkle a bit of curry leaves. Pour a few drops of oil on the sides, close with a lid and cook on low flame. Sprinkle some chutney powder on the top and serve hot with coconut chutney or sambar.