Cut off stem end. For larger peppers, cut into discs, about an eighth of an inch thick. You can leave smaller peppers whole or halve them lengthwise.
Place chile peppers on a dehydrator tray, with space between them.
Dry at 135 degrees for 6 to 8 hours.
When thoroughly dry and brittle, transfer to a food processor bowl and pulse until the dried chile pepper flakes are a size you like.
Notes
If you don't have a food processor, put the dried chile peppers in a bowl and crush with a heavy wooden spoon. Or use a mortar and pestle.
Any sort of chile pepper can be used to make this homemade seasoning. Cayenne peppers, jalapeño peppers, ghost peppers. The hotter the pepper is when it’s fresh, the hotter your pepper flakes will be.