Mix the ground dal paste, powdered oats and salt. Add required quantity of buttermilk to form a smooth batter of dropping consistency.
In a bowl, mix together onion, tomato, green chili (opt) and coriander leaves. Keep aside. Heat a non-stick tawa and add few drops of oil.
Pour a small ladleful of the batter and drizzle some oil around the edges. Sprinkle some of the onion mix over it and cook till one side is done before flipping it over to cook the other side.
Transfer to a serving plate. Make similar uttapams and serve them hot with coconut chutney and sambar as accompaniments for a healthy and a sumptuous breakfast.
