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How to make gluten free bread 
Combine the brown rice flour, tapioca flour/starch, cornstarch, and potato flour. 
To have a gluten-free flour blend ready for your bread, mix the ingredients together before you start making the dough. Set aside.
If you aren't able to find potato flour at the store, you can use instant mashed potato flakes. Pulverize them in a blender or food processor several times to give them a light, flour-like texture.