Chocolate Coconut Sheet Cake

Thank you, Martha Stewart!

Cake:

  • Unsalted butter, softened, for pan
  • 3/4 cup unsweetened cocoa powder, plus more for dish
  • 1 1/2 cups all-purpose flour
  • 1 1/2 cups granulated sugar
  • 1 1/2 teaspoons baking soda
  • 3/4 teaspoon baking powder
  • 3/4 teaspoon coarse salt
  • 2 large eggs, lightly beaten
  • 3/4 cup low-fat buttermilk
  • 3/4 cup warm strong brewed coffee
  • 3 tablespoons safflower oil
  • 1 teaspoon pure vanilla extract

Topping:

  • 1 stick plus 2 tablespoons unsalted butter, plus more for dish
  • 2 cups confectioners’ sugar
  • 6 tablespoons unsweetened cocoa powder
  • 3 cups finely shredded dried unsweetened coconut
  • 2/3 cup warm strong brewed coffee
  • 1 teaspoon pure vanilla extract
  • Whipped cream and toasted large-flake coconut, for serving

Directions

Cake: Preheat oven to 350 degrees. Butter a 9-by-13-inch baking dish; line bottom and 2 long sides with parchment, leaving an overhang. Butter parchment, and dust with cocoa powder. Whisk together cocoa powder, flour, granulated sugar, baking soda, baking powder, and salt in a large bowl. Gather flour mixture into a mound, and create a well in center. Pour eggs, buttermilk, coffee, oil, and vanilla into well, and whisk until thoroughly combined and smooth. Pour batter into dish, and spread evenly with an offset spatula. Bake until set and a toothpick inserted into center comes out clean, about 25 minutes.

Topping: Meanwhile, melt butter for topping in a small saucepan. Combine confectioners’ sugar, cocoa powder, and coconut in a large bowl. Stir coffee and vanilla into butter, and pour over coconut mixture. Stir to combine, and immediately spread evenly over warm cake. Let cool completely on wire rack.

To serve, use parchment to transfer cake to a cutting board. Cut into thirds lengthwise, then cut into quarters crosswise, and then cut quarters into eights. This is a very rich cake. You can serve with whipped cream and toasted coconut, although I’d skip the former.

Cake can be refrigerated in dish, wrapped in plastic wrap (do not let plastic touch cake), up to 3 days. Once, when Mrak was literally locked out of the kitchen (floors were being redone), he ate a piece that was six days old. According to him, “It continued to be moist and tasty.” 😀

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