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Preheat the oven to 350 degrees Farenheit.
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Get a 9x9 baking pan and coat with non-stick cooking spray.
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In a medium mixing bowl, combine the butter the sugar and beat until fluffy.
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Add pumpkin, sour cream, eggs, and vanilla and mix until combined.
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In a separate bowl, combine the dry ingredients (flour, baking powder, nutmeg, and salt).
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Add the dry ingredients to the wet. Mix until smooth, scraping down the sides.
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Set mixture aside.