White or brown rice flour is fine. If you use white sugar instead of date sugar, omit the honey. Substitute cornstarch for the arrowroot if preferred. Use guar gum instead of xanthan gum if preferred. Nutmeg can be used instead of ground ginger.
Substitute fruit-flavored kefir for the buttermilk if desired. Use melted butter instead of oil if preferred. Agave can be used in place of honey.
If making 12 large muffins, increase baking time to 20 minutes.