In a medium-sized mixing bowl, combine the sorghum flour, baking powder, baking soda, salt and chia seeds.In a high speed blender (such as a Vitamix), add the 2 egg yolks, maple syrup, coconut oil, vanilla, brown rice and water. Process until smooth and creamy. Pour the wet ingredients in with the dry.Add the 3 egg whites to the Vitamix and whip until light and fluffy. Carefully fold the whipped egg whites in with the pancake batter.Lightly oil the bottom of a heavy skillet and heat over medium heat. When the skillet surface is hot, ladle ¼ cup batter for each pancake. Cook until small bubbles start to form, then flip the pancakes and continue cooking for about 1½ minutes, or until golden.