In a mixing bowl mix together suji, maida, baking soda and oil.
Add little water at a time a knead dough.
Knead the dough for 4-5 minutes with your palm till it becomes soft.
Cover the dough with moist towel for ½ hour.
After half hour knead the dough once again and divide it into 4 parts.
Spread a lightly moist towel on a tray.
Roll them to small balls and keep them cover so that they do not dry up.
Now dip the ball in dry flour and roll it to make a thin and big circle.
Now cut the roti into small circles with the help of small bowl or bottle cap.
Take out the puri and place them on the moist towel and cover with the moist towel.
Heat the oil at high heat add one puri at a time and shake the oil little bit with your spatula as shown in video that will make all the puris puff.
Fry till crisp and golden brown from both the sides.
Let them cool down for some time before using. Once cold enough you can store them in air tight container for a week.