Preheat oven to 350° F. Prepare 1 regular sized loaf pan (8.5 X 2.5 X 2) by spraying it with cooking spray.
Whisk together ground flaxseed with water in a small bowl with a fork and let it sit for a few minutes until an gel like consistency forms.
In a large bowl, combine the dry ingredients (flour, baking powder, baking soda, cinnamon pumpkin pie spice and salt). Combine the wet ingredients (pumpkin, sugar, maple syrup, vanilla, oil, apple sauce and flax egg) in a medium-sized mixing bowl and blend well. Add the liquid mixture to the dry and stir well.
Pour batter into the loaf pan and place on the center rack of oven. Bake for 60 minutes or until a toothpick inserted in the middle comes out clean.
Allow to cool before removing from pan.