In a huge bowl take aata, salt and baking soda. Add a little pinch of Baking soda and mix well. Ensure not to add too much Baking Soda.
Now add oil and mix and rub between both palms.
Knead the dough with water. Quantity of water might be a little bit depending upon the texture of the aata.
Knead it for a couple of minutes and cover the dough with a damp towel or with an inverted bowl.
Keep it for 1/2 an hour.
Preheat microwave for 10 minutes keeping the plate inside on which we need to cook roti. If you are using an OTG, preheat the OTG between 250°C and 300°C.
Make five balls out of dough. Roll each ball into a roti with a rolling pin on wood board (chakla) or with hands.
Place the rotis on a hot steel plate or the OTG tray.
Keep this plate on the grill rack. Close the door.
Select 'grill' from the cooking functions. Now set the time for 14 minutes. If the rotis are thick, then set more time. Though I set for 16 minutes, my rotis were all set in 13 minutes. If you are using an otg, set the timer between 8 to 10 minutes.
Now begin cooking by pressing start/go button.
After 7 or 8 minutes roti will be all set from one side. Open the microwave door and turn the rotis to the other side.
Again close the door and continue cooking with the staying time. Roti is all set. Get from the microwave.
Keep an eye on the rotis through the door. Next batch of rotis will take less time.