Reddit reviews The Great Chile Book: [A Cookbook]

I had this book but loaned it to someone and never got it back.
https://www.amazon.com/Great-Chile-Book-Mark-Miller/dp/0898154286

If you are trying to make a dry chili POWDER to add to your chili recipe, I suggest reading the ingredients on the back of your favorite chili powder and then purchasing the WHOLE spices listed there.

Whole spices toasted and then ground provide tremendously more flavor than any factory ground spices.

I agree with the dried peppers comments - but don't soak them if you are making a chili powder. Simply toast the whole chiles in a dry skillet, let them cool and remove the seeds, stems and inner white ribs of each pepper. Grind the toasted skins into fresh single variety chili powder powder.

How to pick a chile variety? Research! https://www.amazon.com/Great-Chile-Book-Mark-Miller/dp/0898154286

High quality dried garlic and onion powders are also necessary for a good chile powder. Penzey's is a good source for those. Buy only what you need as spices lose their pungency as they age.

You'll most certainly need: Cumin and Corriander seeds. We usually start with a 2:1 ratio of the two for our chili powder mixes.

Have fun with it, spice mixing is like art!