In a mixing bowl, combine the dry ingredients. Add the eggs, coffee, buttermilk, oil and vanilla and beat on medium speed for 2 minutes - batter will be thin. Pour into a well greased and floured 10" Bundt pan.
Bake at 350 for 45-50 minutes or until tests clean. Let set before removing from the pan. Allow to cool completely on a wire rack, then dust with powdered sugar.