[NOTE: since I no longer buy bread flour I add 2T wheat gluten = 1 t. per cup of flour][I came up with a 6 cup recipe because of the size of my food processor bowl — it can handle closer to 7 cups but prob not 8 cups.
Combine 2 cups finely ground brown rice flour, 2/3 cup potato starch and 1/3 cup tapioca starch, mix VERY well before each use and add xanthan at about 1/4 t.percupof mix.