Thomas Keller, author of the The Complete Keller: The French Laundry Cookbook & Bouchon has a new gluten free flour called Cup 4 Cup. You can use this flour as a cup for cup substitute in any of your gluten recipes. The ingredients in this flour is cornstarch, brown rice flour, white rice flour, potato starch, tapioca starch, milk powder, and xanthan gum.
To test this flour, I used it in three different gluten recipes.
I started off with the classic Toll House Chocolate Chip cookie. I made this recipe four times, with three different flours. I used C4C, Better Batter Flour, and King Arthur Flour. The fourth recipe I made allergy friendly, no gluten, no dairy, no eggs. I made this not really for comparison, but because if I made all these cookies and my kids couldn't eat any they would have a fit!
Toll House Cookie Recipe: