For those who can tolerate gluten free oats, here are some fabulous challah recipes.
Gluten free challah dough is often more like batter than dough (very difficult to shape or braid).
A great trick is to use silicone pans that are shaped like challahs (think "challah molds").
Gluten Free Challah Recipe Thread
Gluten Free Challah Recipe
Gluten Free Oat Bread Mix
