Make the cake:
Position a rack in the center of the oven and heat the oven to 325°F. Grease and lightly flour the bottom and sides of a 10-cup fluted tube pan.
In a medium bowl, combine the flour, baking powder, baking soda, and salt; whisk until well blended. Beat the butter on medium-high speed with a stand mixer fitted with a paddle attachment (or use a large bowl and a hand-held electric mixer) until smooth, 1 min. Add the sugar and vanilla bean seeds or extract and continue beating until well combined and fluffy, 2 min. Stop to scrape the bowl as needed. Add the eggs, one at a time, beating well for 30 seconds and then stopping to scrape the bowl after each addition. Add half of the flour mixture and mix on low speed until just blended. Add the sour cream and mix until just blended. Add the remaining flour mixture and beat on low speed until just blended.
Scrape the batter into the prepared pan and spread evenly with a rubber spatula. Bake until the top of the cake is light brown and a cake tester or toothpick inserted in the center comes out with just a few small crumbs attached, 50 to 55 min.
Transfer the cake pan to a rack and let cool for about 15 min. If necessary, run a knife between the cake and the pan to loosen the cake. Invert the cake onto the rack and lift off the pan. Set the rack over a large sheet of waxed paper or foil (to catch the glaze later) and let the cake cool completely.
Glaze the cake:
In a small bowl, combine the confecctioners’ sugar, heavy cream, corn syrup, and vanilla bean seeds or extract. Stir until well blended, smooth, and shiny. The glaze should be thick but fluid enough to fall from a spoon. If it isn’t, add more cream, 1 tsp. at a time, until the glaze thins to the right consistency. Spoon the glaze evenly over the top of the cake. The glaze should form thick ribbons that drip down the sides of the cake. If the glaze resists dripping on its own, use the back of the spoon to encourage it. Let the glaze set for at least 1 hour before serving. Store loosely covered at room temperature for up to three days. (The cake can also be frozen unglazed.)
nutrition information (per serving):
based on twelve servings, Calories
24, Fat Calories
210, Saturated Fat
7, Monounsaturated Fat
62, Polyunsaturated Fat
Photo: Scott Phillips