First of all take leftover chapati and cut into strips then these strips shallowfry for few minutes. When strips become crispy then remove from pan now cut into pieces take a bowl and add in that. Now take namkeen in that bowl also take chapati strips pieces now add sweet curd and chopped tomato, onion,

Add tamarind chutney and red chilli powder rock salt and chat masala. Mix it well. Adjust taste about your choice then add chopped coriander and zero number sev

You can also try fried peanuts in your chat. It's very delicious and yummy tasty chat. You can serve as it is.