Preheat the oven to 350ºF (177ºC) and line a bread loaf pan with parchment paper.
In a small bowl mix the ground flax seed with water and set aside. In another small bowl add the almond milk and apple cider vinegar and set aside.
In a medium-sized bowl add the oat flour, almond flour, baking soda, baking powder, pumpkin pie spice and sea salt. Whisk to combine. In a separate large bowl add the pureed pumpkin, maple syrup, olive oil, almond milk mixture and flax mixture. Whisk until combined.
Add the dry ingredients to the wet and stir to combine. Fold in the chopped walnuts. Fill loaf pan and place in the oven to bake for one hour.
Remove from oven and let cool before slicing and serving. Enjoy!
