Boil 3 tablespoons of cubed potato in water until just cooked, then drain and let dry. Crisp 2 cups of puffed rice (murmura) in a dry pan if it has gone soft, then let it cool.
In a large bowl, toss the puffed rice with the potato, 2 tablespoons of finely chopped onion, 3 tablespoons of chopped tomato, 2 tablespoons of chopped cilantro, and 1 chopped green chili.
Add 1 tablespoon of tamarind chutney and 1 tablespoon of green chutney (cilantro-mint chutney) a little at a time, mixing gently to coat.
Sprinkle with ½ teaspoon of chaat masala and season with salt and red chili powder. Toss in 2 tablespoons of roasted peanuts, 10 crushed papdis (crisp fried crackers), and ¼ cup of nylon sev.
