Place all the whole spices (coriander, cumin, cloves, cardamom) in a skillet over medium low heat and toast until they become fragrant, stirring often, about 3-5 minutes.
Remove from the heat and let the spices cool slightly.
Place them in a spice grinder or a mortar with the bay leaf and grind them until a *mostly fine powder is formed (it doesn't have to be super fine).
Mix together with the ground spices.
Store in a covered jar in a cool dark place for up to 1 year.
Notes
If using ground spices only, place them all in a skillet and toast then for 1-2 minutes, stirring. This will give them an extra boost of flavor as it helps bring some oils out.
Add ¼ teaspoon of cayenne pepper if you want some heat to your seasoning blend.
Store in a jar with a lid in a cool dark place to keep it fresh.