Mix the Edible Rice Bran, Atta Flour and salt together in a bowl.

Add water and whisk until it becomes a slightly thick batter

Let it sit/rest for 10 - 15 minutes

Heat the oil, and fry the mustard seeds.

Once the mustard seeds have popped, add the onions and green chilies. Give them a quick stir.

Take it off the heat and mix into the batter.

Heat a tawa and pour thosai batter. 

Cook on both sides and then serve hot.