To measure brown-rice flour and tapioca flour, use a large spoon to scoop flour into a measuring cup, then level it off with the back of a knife. Do not use the measuring cup itself to scoop your flour when measuring; it will compact the flour and you will have too much for the recipe.
Add both flours to a large resealable plastic bag, along with potato starch; reseal and shake until well combined.
Keep refrigerated until ready to use, up to 6 months.
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