Heat oil over medium heat in a heavy bottomed wok/kadai. To check the right temperature and thickness of the puri, test one puri, it should sizzle, float and puff up immediately.
Gently slide a few puris in the oil, fry on medium-high heat,you will see them rising on top and puffing up within a few seconds. You may nudge the puris with a slotted spoon to help them puff up. Reduce the temperature to medium-low once the puris puff up to maintain the temperature.
Keep flipping them on both sides until it reaches a light golden brown color. The ones that don’t puff up can be used for other chaat snacks like sev puri etc.
Fry the remaining puris, in the same way, maintaining the temperature of the oil as required. If the oil is too hot, the puris will burn, and if it is warm, the puris will absorb a lot of oil.