Add the guajillo, arból chiles, coriander seed to your blender and blend for about 30 seconds until you have a fine powder.
In a small mixing bowl add the remaining ingredients and mix well.
Add the ground chile peppers and coriander seed and mix well.
Notes
Note: The recipe doesn't include salt which is intentional. We have left it up to you to decide how much salt to use based on your tastes and dietary preferences. If you want to add salt, a good starting point would be to add 1 tablespoon to the seasoning mix.