Dehydrating, either in an oven set as little as it’ll go (close to 200 degrees) or simply a business dehydrator, will dry most kinds of chiles in about a day. Toasting whole chiles in advance of grinding is a great way to add complexity when generating your own private flakes. https://andresfqods.yomoblog.com/37220370/chili-powder-sweet-paprika-powder-can-be-fun-for-anyone