Preheat oven to 350 degrees. Butter and flour 10-inch bundt pan or spray with baking spray.
Beat together sugar and butter in a mixer at medium speed until pale and fluffy, scraping down sides of bowl as needed. Reduce speed of the mixer to med/low and add eggs one at a time and beat well after each.
Whisk together all dry ingredients except the baking soda. Stir the buttermilk and baking soda together. Add the dry and wet ingredients to the mixer bowl(alternating)ending with the dry. Mixing on low/stir speed just until blended. Stir in the vanilla extract.
Pour into prepared pan. Tap pan on the counter to remove any air bubbles. Bake for about 1 hour or until a cake tester comes out clean.
Remove from oven and allow the cake to cool in pan for about 1 hour. Invert onto a cooling rack and allow to cool at least 1 more hour.
Sift powdered sugar over the cake when completely cooled.