Preheat the oven to 350 degrees Fahrenheit.
In a small bowl, combine the ground flax seed and water, stir and set aside.
In a medium mixing bowl, whisk together the flours, baking powder, baking soda, salt, and pumpkin pie spice.
In a large mixing bowl, stir together the pumpkin, oil, brown sugar, milk, flax egg, and vanilla extract.
Add the dry ingredients and stir just until everything is mixed and then pour into a well-oiled 9"x5" bread pan.
Bake bread for 55-65 minutes. Test with a toothpick and cook an additional 5-10 minutes if toothpick does not come out clean.
Allow to cool completely. Transfer bread out of the pan using the parchment paper.
Combine the powdered sugar, 2 teaspoons milk, and cinnamon in a small bowl. Stir well. Pour glaze over the top of your cooled bread loaf and sprinkle with chopped ginger. Allow to sit until hardened and then slice and serve!