There are more GF mixes than you can shake a stick at and it is a very personal kinda thing cause when you can’t have the normal stuff you really want to get it as close as you can. This is my mix that I use cup for cup for regular flour, I have had GREAT luck with it for all types of foods.
2 cups sorghum flour, 3 cups brown rice flour, 3 cups white rice flour, 2 cups tapioca flour, 2 cups potato starch, 1/2 cup ground flax seed, /2 cup potato flour, 1/4 cup xanthan gum
Mix all together in LARGE and I do mean LARGE container and then store in fridge.
I use a small coffee grinder and I whiz instant potato flakes to make the potato flour, I also whiz -read grind the flax seed ( I don’t care for the coarse stuff )