3 3/4 cups brown rice flour
3 3/4 cups white rice flour
3 cups sweet rice flour (if you can’t find this use cornstarch)
3 cups tapioca flour
1 Tbl plus 1 tsp xanthum gum
Combine all the ingredients in a large bowl and mix thoroughly. Make sure that you don’t see any clumps or streaks of individual flours. I’ve often used a food processor to combine these.
Transfer the flour to a canister or other storage container.