Urad dal (split black lentils):1/4 cup
Chana dal(Bengal gram):1/2 tsp
Mustard seeds:1 tsp
salt to taste
ginger-green chilli paste:1 tsp
Oil for greasing
Combine the oats and urad dalchana dal and blend in a mixer to a smooth powder.
Add 1½ cups of water,curd, salt and green chilli paste and mix well to make a batter consistency.
Cover and keep aside for 1 hour.
Grease the idli moulds using the oil and put spoonfuls of batter into them.
Steam in an idli steamer for 15 to 20 minutes or till they are cooked.
Repeat with the remaining batter to make more idlis.