In a small bowl mix the golden flax meal and the warm water and set aside for at least 10 minutes. (Longer is ok, begin other steps when you are ready to make the muffins)
Preheat oven to 325 and get your muffin pan ready with liners.
Pour the unsweetened rice milk in a cup, add the apple cider vinegar, stir and set aside. I will refer to this later as buttermilk.
Grate the zucchini to generously fill one measuring cup and set aside.
In mixing bowl whisk flours, starches, sugar, baking powder, baking soda, cinnamon, xanthan gum, and salt.
Add zucchini, vanilla, canola oil, buttermilk and flax eggs to dry ingredients and mix well.
Add mixture to muffin pan and bake