Make your own cayenne pepper powder at home from fresh garden-grown or store-bought cayenne peppers with a dehydrator. It is super easy to make and you won't get any fresher. Here is the recipe.
Clean and dry the cayenne peppers. Wearing gloves, remove the stems and slice in half lengthwise. Remove the seeds if you wish.
Set the sliced cayenne peppers onto dehydrator sheets and dehydrate at 135 degrees F (or at your dehydrator's recommended temperature) for 8 hours, or until they are completely dried through.
Crush the dried cayenne peppers in a mortar and pestle, or add them to a spice grinder and grind them to a powder.
Sift the powder and process the remaining chunks until only a fine powder remains.
Store in airtight containers.
Video
Notes
Heat Factor: Medium. Cayenne peppers have a fair amount of heat, but not overly so, which makes them an ideal seasoning for many spicy food lovers.