Once the oven has come up to temperature, sieve the flours, salt, sugar and xanthan gum powder into a medium sized mixing bowl. (ericbakker.com)
I have Xanthum Gum powder kicking about in the cupboard, can it be used instead of Agar Agar powder? (cookingwithplants.com)
* If you are making the gluten free version and are using Bob's Red Mill Gluten Free All Purpose Baking Flour you use the same amount of flour but add 1/2 tsp Xantham Gum powder. (strawberriesforsupper.com)