Break the egg in a bowl and add salt, green chilly, chopped coriander and chopped onions. Whisk it.
Roll out the dough flat and as very thin. Heat a tawa or a pan to medium hot. Place the rolled out dough on hot pan and cook on both sides for a minute each. Now lower the heat and slowly pour the whipped egg on the parantha. Using a spoon spread it on the entire parantha. Let it cook for 30 seconds. Now gently fold the parantha from all sides towards the centre to shape it like a square. Press gently, drizzle oil and turn it. Drizzle oil again and cook on both sides till it browns.
Remove and serve hot.