Take a wok, add oil and heat it.
Add mustard seeds, cumin seeds and let them pop up.
Add chana dal/bengal gram and saute for few seconds
Add chopped green chillies, curry leaves and saute for few seconds.
Add chopped onions, mix well.
Add salt as per taste.
Add turmeric powder and mix well.
Add dry roasted oats, mix well.
Add one and a half cups of water and stir well.
Add freshly chopped coriander leaves.
Cook the oats upma for 2-3 minutes or until the water gets absorbed.
Switch off the flame.
Serve the oats upma hot.