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 teaspoon Baking powder, ½ teaspoon Baking soda, ½ teaspoon Salt, 2 teaspoon Ground cinnamon, 1 teaspoon Pumpkin pie spice, ¼ teaspoon 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.
½ cup Unsalted butter, ¾ cup Brown sugar, 1 Large egg, 1 teaspoon Pure vanilla extract, ½ cup Buttermilk, ¼ cup Sour cream