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Preheat oven to 350 degrees. Spray a 14-cup Bundt pan with cooking spray. Dust with flour, and tap out excess.
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Whisk together flour, baking powder, baking soda, salt, ginger, cinnamon, nutmeg, and cloves. Set aside.
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Beat butter and brown sugar together in the bowl of an electric mixer fitted with the paddle attachment, on medium speed until pale and fluffy, 2 to 3 minutes. Add eggs, one at a time, beating well after each addition and scraping down sides of bowl. Reduce speed to low. Beat in flour mixture in 3 additions, alternating with the buttermilk. Beat until just combined. Add pumpkin puree, and beat until combined. Pour batter into prepared pan.
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Bake cake until golden and a wooden skewer inserted into the center comes out clean, about 55 minutes. Let cool on a wire rack for 30 minutes. Carefully turn cake onto rack too cool completely. Before serving, dust with confectioners' sugar.