Combine rice flour, potato starch, tapioca flour, and sorghum flour in a large bowl. Mix together with a whisk until thoroughly combined.
Transfer flour mixture to an airtight container and refrigerate until ready to use. This gluten-free flour mix will keep for 4 months in the refrigerator.
Denise Jardine is a certified nutrition educator, and the Regional Healthy Eating Program Coordinator for Whole Foods Market, Northern California. Denise lives in the San Francisco Bay Area with her husband Robert.