Combine flours, xanthan gum, baking powder, soda, salt, chia seeds, and spices together in a large bowl. Whisk ingredients well to combine. Make a well in the center of the dry ingredients. Set aside.
Pour wet ingredients into well in dry ingredients. With large spoon, mix ingredients together just until dry ingredients are fully incorporated. Do not overmix.
Spoon batter into prepared mini loaf cavities or muffin cups, filling almost to the rim. Let sit for 3 –4 minutes before transferring to pre-heated oven. Immediately reduce oven temperature to 400°F.
Bake for 16-18 minutes, or until loaves/muffins are just firm to the touch and a cake tester inserted into center of muffin or loaf comes out clean. Remove from oven and let loaves/muffins rest in pans for 5-7 minutes then gently remove from pan and transfer to wire rack to cool completely.
Yield: 8 mini loaves or 10 standard-sized muffins