For  this recipe to work you MUST measure the ingredients on your scale. Courtesy of www.glutenfreeonashoestring.com   Makes 10 Cups of GF Flour Blend 434 grams White Rice Flour 252 grams Cornstarch 238 grams Brown Rice Flour 210 grams Tapioca Starch 196 grams non-fat dry milk 42 grams Potato starch 28  grams Xanthan Gum