Preheat oven to 350 degrees. In a large bowl, beat 2 cups butter with an electric mixer on medium to high speed for 30 seconds. Add granulated sugar, baking powder, baking soda, salt, cinnamon, and nutmeg. Beat until combined, scraping bowl occasionally. Add eggs and 2 t vanilla; beat until combined. Beat in pumpkin. Beat in as much of the flour as you can with the mixer. Using a wooden spoon, stir in any remaining flour.
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