Add the cinnamon, pumpkin pie spice, whole-wheat flour, baking powder and salt and mix until just combined. Gently stir in the water. (It's supposed to be a thick batter, so only add 1/4 cup water). Do not overmix! It's OK if the batter is slightly lumpy.
In a large bowl, mix the eggs, brown sugar and coconut oil together. Add the buttermilk, Greek yogurt, vanilla and pumpkin puree and whisk until combined.