On the night before you want to have your waffles, combine the flour, 1 1/2 cups water and sourdough starter in a large bowl and mix well. Cover with plastic wrap and let sit overnight (or at least 4+ hours).
The following morning, mix in the coconut oil, eggs, maple syrup, salt pumpkin, and spices. Mix well.
Preheat your waffle iron.
Whisk the water and baking soda in a small bowl until the baking soda is dissolved.
Mix the baking soda/water mixture into your batter.
Pour batter into your waffle iron and cook until your desired crispiness. We like ours golden brown and crispy.
Top with butter and warm, pure maple syrup. I also sprinkled our finished waffles with some more pumpkin pie spice. Enjoy!