Substitutions: Sub 1/2 cup of whole milk for the buttermilk and omit the baking soda. Sub 4 tablespoons of cold coconut oil for the butter and 1/2 cup of coconut milk for the buttermilk; omit the baking soda. Sub 1 cup of King Arthur Gluten-Free Multi-Purpose Flour for the flour and add 1 /4 teaspoon of xanthan gum.