In a large bowl, mix the flour, baking powder, baking soda, salt, cinnamon, pumpkin pie spice, and nutmeg. Set aside. Place the pumpkin puree on a plate. Press a paper towel on the plate. Do this about 4 times so it soaks up the extra moisture.
2 cups All-purpose flour, 2 tsp Baking powder, 1/2 tsp Baking soda, 1/2 tsp Salt, 2 tsp Ground cinnamon, 1 tsp Pumpkin pie spice, 1/4 tsp Ground nutmeg, 15 oz Pumpkin puree
In a separate bowl, mix the melted butter, pumpkin puree, brown sugar, egg, vanilla, sour cream, and buttermilk. Pour the wet ingredients into the dry. Mix until just combined.
1/2 cup Unsalted butter, 3/4 cup Brown sugar, 1 Large egg, 1 tsp Pure vanilla extract, 1/2 cup Buttermilk, 1/4 cup Sour cream