<<Disclaimer: Verify this information before applying it to your situation.>> Hi Charlie, The best substitute for regular flour is the formula for most GF bread etc. It is two parts white rice flour,two-thirds part potato starck flour and one third part tapioca flour.Example 6 cups white rice flour,2 cups potato starch flour and l cup tapioca flour. I ususally use half white and half brown rice flour but you could use all one or all the other. Good Luck, Bev Chevalier