Tuxedo Cake

Ingredients:

  • 1 and 3/4 cups (220g) all-purpose flour (spoon & leveled)
  • 3/4 cup (65g) unsweetened natural cocoa powder
  • 1 and 3/4 cups (350g) granulated sugar
  • 2 teaspoons baking soda
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 2 teaspoons espresso powder (optional)*
  • 1/2 cup (120ml) canola or vegetable oil
  • 2 large eggs, at room temperature
  • 3/4 cup (180g) full fat sour cream, at room temperature
  • 1/2 cup (120ml) buttermilk, at room temperature*
  • 2 teaspoons pure vanilla extract
  • 1/2 cup (120ml) hot water or coffee*

White Chocolate Ganache

  • three 4 ounce (340g) white chocolate bars, finely chopped*
  • 1/2 cup (120ml) heavy cream

Chocolate Silk Frosting

  • 1 cup (230g) unsalted butter, softened to room temperature
  • 4 and 1/2 cups (540g) confectioners' sugar
  • 3/4 cup (65g) unsweetened natural or dutch-process cocoa powder*
  • 1/2 cup (120ml) heavy cream or whole milk
  • 1 Tablespoon light corn syrup or honey*
  • 2 teaspoons pure vanilla extract
  • 1/8 teaspoon salt
  • optional for garnish: fresh raspberries and mint

Directions:

  1. Preheat the oven to 350°F (177°C) and grease three round 9-inch cake pans. Set aside.
  2. Make the cake: Whisk the flour, cocoa powder, sugar, baking soda, baking powder, salt, and espresso powder (if using) together in a large bowl. Set aside. Using a handheld or stand mixer fitted with a whisk attachment (or you can use a whisk) mix the oil, eggs, sour cream, buttermilk, and vanilla together until combined. Pour the wet ingredients into the dry ingredients, add the hot water or coffee, and whisk or beat it all until the batter is completely combined.
  3. Divide batter evenly between 3 pans. Bake for 21-25 minutes. Baking times vary, so keep an eye on yours. The cakes are done when a toothpick inserted in the center comes out clean.
  4. Remove the cakes from the oven and set on a wire rack. Allow to cool completely in the pan.
  5. As the cake cools, prepare the white chocolate ganache so it can cool and be ready at the same time. Place chopped white chocolate in a bowl. Heat the cream in a small saucepan until it begins to gently simmer. (Do not let it come to a rapid boil-- that's too hot!) Pour over white chocolate and stir until completely combined and chocolate has melted. Cover and refrigerate until it's thick and a spreadable consistency, about 1-2 hours. You don't want it runny.
  6. Make the frosting: In a large bowl using a handheld or stand mixer fitted with a paddle or whisk attachment, beat the butter on high speed until creamed, about 2 minutes. Add 4 cups confectioners' sugar, the cocoa powder, milk/cream, corn syrup, vanilla, and salt. Beat on low speed for 30 seconds, then switch to high speed and beat for 2 minutes until combined and smooth. If you want the frosting a little thicker, add the extra 1/2 cup of confectioners sugar. (I add it.)
  7. Assemble and frost: Place 1 cake layer on your cake stand or serving plate. Evenly cover the top with 1/2 of the white chocolate ganache. Top with 2nd layer and evenly cover the top with remaining ganache (if there is too much ganache, serve a dollop/spoonful with each slice!). Top with the third cake layer. Spread the frosting into a thick layer all over the top and sides. Garnish with raspberries and mint, if desired. Refrigerate for at least 45 minutes before slicing or else the cake may gently fall apart as you cut.
  8. Cover leftover cake tightly and store in the refrigerator for 5 days.

Make ahead tip: Prepare cake through step 4. Wrap the individual baked cake layers tightly and refrigerate for up to 2 days or freeze up to 3 months. Bring to room temperature, make the ganache and frosting, assemble/frost, and serve. Frosted cake freezes well, up to 3 months. Thaw overnight in the refrigerator, bring to room temperature or serve cold.

Recipe Notes:

  1. Why room temperature? All refrigerated items should be at room temperature so the batter mixes together easily and evenly. Read here for more information. Instead of sour cream, try using plain yogurt. The cake won't taste as rich, but it's a fine sub. If needed, you can use whole milk mixed with 1/2 teaspoon of white vinegar or fresh lemon juice instead of buttermilk.
  2. Espresso powder and coffee will not make the chocolate taste like coffee. Rather, they deepen the chocolate flavor. I highly recommend them both. If coffee isn't your thing, you can leave out the espresso powder and use boiling hot water instead of the hot coffee.
  3. White chocolate bars are typically sold in 4 ounce bars. I suggest Ghirardelli, Baker's brand, or Lindt. They are found next to the chocolate chips in the baking aisle. Finely chop the white chocolate so it melts easier and quicker.
  4. Use natural cocoa in the cake, not dutch-process. There is no leavening occurring in the frosting, so you can use 3/4 cup of either. In the pictured frosting, I used some natural unsweetened cocoa (1/4 cup) and some Hershey's special dark cocoa (1/2 cup). Yum!
  5. Corn syrup or honey is what gives the frosting its silky texture and pretty shine.

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