Peel off the skin and mash 2 medium sized boiled potatoes.
Add 1 small onion finely chopped and 2 tablespoon cilantro finely chopped. Also add ¼ teaspoon chaat masala powder, ¼ teaspoon roasted cumin powder, ¼ teaspoon black salt and salt as needed (if necessary).
Mix well and set it in a bowl.
Whisk ½ cup thick fresh curd and add 1 teaspoon sugar.
Whisk again until the sugar has dissolved and keep it chilled until the dahi puri chaat is ready to be made.
To make Dahi puri, place 6-7 puris on a serving plate and set all the required ingredients – whisked curd, ¼ cup sweet tamarind chutney, ¼ cup spicy green chutney, prepared potato filling, red chilli powder as needed, chaat masala powder as needed, roasted cumin powder as needed, ¼ cup nylon sev, 1-2 tablespoon finely chopped cilantro.
Break the puris at the center and place 1 tablespoon of potato filling inside each puri.
Now add about 1 teaspoon of spicy green chutney into each puri.
Next add about 1 teaspoon sweet tamarind chutney into each puri.
Pour 1-2 tablespoon of mildly sweetened dahi into each puri.
Sprinkle the puris with red chilli powder, roasted cumin powder and chaat masala powder as needed.
Generously sprinkle the puris with nylon sev and finely chopped cilantro.