For the cupcakes:
- ½ cup plus 1 tablespoon Dutch-process cocoa powder
- ½ cup plus 1 tablespoon hot water
- 2¼ cups all-purpose flour
- ¾ tsp. baking soda
- ¾ tsp. baking powder
- ½ tsp. salt
- 2 sticks plus 1 tablespoon unsalted butter, at room temperature
- 1 2/3 cups sugar
- 3 large eggs, at room temperature
- 1½ tsp. vanilla extract
- 1½ tsp. coconut extract
- ¾ cup sour cream
For the frosting:
- ½ cup plus 3 tbsp. heavy cream, divided
- 2¼ cups plus 2 tbsp. confectioners’ sugar, divided
- 10 tbsp. (5 oz.) unsalted butter, at room temperature
- 10 oz. cream cheese, cold
- Pinch of coarse salt
- 2 tsp. coconut extract
- ¾ tsp. vanilla extract
- 5 oz. bittersweet chocolate, finely chopped
- ½ cup plus 2 tbsp. (5 oz.) heavy cream
- 1 tbsp. unsalted butter, at room temperature
- Splash of coconut rum (optional)
- ¾ cup large coconut shavings, toasted
step 1: Show Images
Preheat the oven to 350˚ F. Line cupcake pans with paper liners. In a small bowl, combine the cocoa powder and hot water and whisk until smooth. In another medium bowl combine the flour, baking soda, baking powder, and salt, and whisk to blend.
step 2: Show Images
Combine the butter and sugar in a medium saucepan set over medium heat. Cook, stirring occasionally, until the mixture is smooth and the butter is completely melted. Transfer the mixture to the bowl of an electric mixer and beat on medium-low speed until the mixture is cool, about 4-5 minutes. Add the eggs one at a time, mixing well after each addition and scraping down the sides of the bowl as needed. Blend in the vanilla, coconut extract, and then the cocoa mixture until smooth. With the mixer on low speed, add the flour mixture in three additions alternating with the sour cream, beginning and ending with the dry ingredients and mixing each addition just until incorporated.
step 3: Show Images
Divide the batter evenly between the prepared liners. Bake until a toothpick inserted in the center comes out clean, about 18-20 minutes, rotating the pans halfway through baking. Let cool in the pan about 5-10 minutes, then transfer to a wire rack to cool completely.
step 4: Show Images
To make the frosting, combine ½ cup plus 2 tablespoons of the heavy cream with 2 tablespoons of the confectioners’ sugar in the bowl of a mixer fitted with the whisk attachment. Whip on low speed at first, increasing the speed to high as the mixture begins to thicken, until stiff peaks form. Keep a close eye to be sure you don’t overbeat and end up with butter. Transfer the whipped cream to a bowl and set aside.
step 5: Show Images
In the now empty mixer bowl, combine the butter and cream cheese. Beat together on medium-high speed using the paddle attachment until smooth and light, about 2-3 minutes. Sift in the remaining 2¼ cups of confectioners’ sugar into the bowl and beat into the butter mixture until incorporated, about 1 minute. Blend in the remaining 1 tablespoon of heavy cream, salt, coconut and vanilla extracts. Once incorporated, beat the mixture on medium-high speed for 2-3 minutes until light and fluffy. Using a spatula, gently fold the reserved whipped cream in two additions into the coconut frosting mixture to lighten it, mixing each just until no streaks remain.
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Transfer the frosting to a pastry bag fitted with a wide plain round tip. Pipe a round dome of frosting onto each cupcake. (I leveled the cupcakes first. This isn’t required but makes shaping the frosting easier and makes a little extra room for the frosting.) Chill the cupcakes for at least 15 minutes to set the frosting while you prepare the ganache.
step 7: Show Images
Place the chopped chocolate in a small bowl. Heat the heavy cream in a small saucepan (or in the microwave) until just simmering. Pour the hot cream over the chocolate in the bowl. Let stand 2 minutes, then whisk until smooth. Whisk in the butter and the rum, if using. One at a time, dip the frosted portion of each cupcake in the ganache so that it is coated in a smooth even layer. Transfer to a wire rack and sprinkle with a few of the coconut shavings. Repeat with the remaining cupcakes.