This cake is unbelievably tender and moist; it's a perfect fall dessert (or breakfast, or snack...)
2 sticks unsalted butter, softened, plus additional for greasing bundt pan
2 1/4 cups all-purpose flour plus additional for dusting pan
2 teaspoons baking powder
1 teaspoon baking soda
1 1/2 teaspoons cinnamon
1 teaspoon ground allspice (I didn't have any so I used 1/2 tsp nutmeg and 1/2 tsp cloves)
1/2 teaspoon salt
1 1/4 cups canned solid-pack pumpkin (from a 15-oz can; not pie filling)
3/4 cup well-shaken buttermilk
1 teaspoon vanilla
1 1/4 cups granulated sugar
3 large eggs
2 T butter
1 cup powdered sugar
1-3 T cream or milk
Preheat oven to 350°F. Butter and flour bundt pan. Combine together flour, baking powder, baking soda, cinnamon, allspice, and salt in a bowl. Whisk together pumpkin, buttermilk and vanilla in another bowl.
Beat butter and granulated sugar in a large bowl with an electric mixer at medium-high speed until pale and fluffy, 3 to 5 minutes, then add eggs and beat 1 minute. Reduce speed to low and add flour and pumpkin mixtures alternately in batches, beginning and ending with flour mixture and mixing until batter is just smooth.
Spoon batter into pan. Shake a few times to be sure to remove any bumps then bake until a wooden pick or skewer inserted in center of cake comes out clean, 45 to 50 minutes. Cool cake in pan on a rack 15 minutes, then invert rack over cake and reinvert cake onto rack. Cool 10 minutes more.
To make glaze, heat butter until melted. Stir in sifted powdered sugar. Mix in cream or milk 1 Tablespoon at a time until desired consistency. Drizzle over cake while it is on a wire rack so excess falls through.