Place the atta flour, water, salt and oil in a bowl and bring the ingredients together with a fork, then go in with your hands and knead to form a ball.
Do not overwork; just form a nice dough ball. The dough should not stick to your hands, but only just. Add more flour or water if required.
Cover the dough and allow it to rest for at least 30 minutes and up to 4 hours.
Pinch off ⅙ of the dough and form a ball, and dip it into some atta flour.
Roll out into an even circle 1-2mm thick, adding more flour if you need to. I find a marble board really helps with this. Repeat with the remaining dough, keeping the chapatis separate with some baking parchment.
Heat a tawa or crepe pan over a medium-high heat and add a chapati. Cook until the top begins to bubble, flip the chapati, cook for 1 minute and flip again. If you have rolled your chapatis evenly, they should puff up.
Repeat with the remaining chapatis, wrap them in a clean tea towel to keep them warm and soft, then serve.