Whip yoghurt with little sugar and salt.
Heat oil and put cumin seeds and boiled & diced potatoes and then add turmeric, chili powder, garam masala powder & salt and fry for few minutes.
Break each puri on top and keep little potato mixture, cooked peas & little sweet chutney. Then fill with whipped yoghurt.
Sprinkle sev, roasted cumin powder, salt, black salt & red chili powder on top and serve immediately.