In a pan heat the oil

As oil heated add chopped onion

Saute it for a while then add tomatoes and green chillies

Saute it for 2 to 3 minutes and add salt if needed now add oats

Saute it for 2 to 3 minutes and add water

Let it boil for 7 to 8 minutes

And here's ots soup is ready,serve hot,added with coriander leaves