Chaat is a favourite at home. We all enjoy it and I do try to make it quite often with whatever ingredients I have in hand. So there is nothing of a compulsion except for a few ingredients which are readilly available. You can just proceed with whatever you have like puffed rice, store bought chiwda, sev,boondi, peanuts ,spicy dals. Mix them with onion and tomatoes. Pour in some sauces and chutneys and your chaat is ready.