Heat heavy pan over medium heat and dry roast coriander seeds for 4 minutes on medium-low heat. Keep stirring to roast evenly. Transfer this to a plate and allow it to cool.
Now in the same pan add cumin seeds and roast them lightly on medium-low heat. Remove from the heat and keep it aside to cool down.
Dry Roast all remaining spices (except bay leaf, mango powder, and Kasuri methi ) together in the pan on low heat for 5 minutes, stirring often to roast it evenly. If the spices are burnt, they will turn quite bitter.
Add bay leaves, continue to dry roast for 1 more minute over low heat, just until the spices are aromatic. Remove from the pan to a plate and spread it out to cool down.
Grind together dried mango powder, Kasuri methi, and the roasted ingredients into a fine powder using a grinder.
Store in a clean, dry, and airtight jar and use it as required.