Jing Gao uses Fly by Jing’s Mala Spice Mix. A mala spice mix recipe adapted from “The Book of Sichuan Chili Crisp: Spicy Recipes and Stories from Fly by Jing’s Kitchen” (Ten Speed Press) is included here.
Gao recommends erjingtiao chiles. Alternatively, Chinese markets carry dried red chiles (la jiao gan), sometimes labeled Sichuan or Chinese chiles. Dried arbol or other chiles are an option, but heat levels will vary.