Simply combine all of the ingredients in a spice grinder or coffee mill and grind to a fine powder.
Store in an airtight container in a cool, dark place for up to 6 months.
To use, simply sprinkle over chaat, sauces, or other dishes just before serving.
Notes
You can dry roast cumin and coriander seeds for 2-3 minutes on low to medium heat before adding them to the grinder. Store in an airtight container in a cool, dark place for up to 6 months.