[header] How to make gluten free bread [title] Combine the brown rice flour, tapioca flour/starch, cornstarch, and potato flour. [step] To have a gluten-free flour blend ready for your bread, mix the ingredients together before you start making the dough. Set aside. 
[substeps] 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.