Can I use ancient grains such as einkorn or spelt?
You can actually use whatever flour you'd like in the recipes... so if you want to use einkorn, the Challenge for you would be 100% einkorn. :)
In fact, the week before the Challenge begins, we release a complete ingredient and equipment list. In it, I include wheat, spelt, or einkorn as options for all the recipes!
Personally, I have made ALL the Challenge recipes with wheat, spelt, and einkorn so I know they turn out fabulous!
And for gluten-free or wheat-free folks, 4 of the 5 recipes have TESTED gluten-free and wheat-free options as well!