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Best Homemade Chocolate Cake
Prep Time: 20 minutes   
Cook Time: 40 minutes
Total Time: 1 hour

Ingredients
For the cake:
8 ounces (227 grams) bittersweet chocolate, finely chopped
2/3 cup (57 grams) Dutch-process cocoa, sifted
2 teaspoons instant espresso powder*
1 cup boiling water
1 3/4 (222 grams) cups all-purpose flour
1 cup (200 grams) granulated sugar
1/2 cup (100 grams) packed light brown sugar
1 teaspoon salt
1 teaspoon baking soda
1 cup (227 grams) sour cream, at room temperature
1/2 cup vegetable oil*
4 large eggs plus one egg yolk, at room temperature
1 tablespoon white vinegar
2 teaspoons vanilla extract
For the frosting:
2/3 cup (133 grams) granulated sugar
4 large egg whites
1/4 teaspoon salt
3 sticks (340 grams) unsalted butter, cut into 12 pieces and at room temperature
12 ounces (340 grams) semisweet chocolate, melted and cooled slightly
1 teaspoon vanilla extract
Instructions
  1. Make the cake:
  2. In a medium heatproof bowl add the chocolate, cocoa powder, and espresso powder. Pour hot water over mixture. Cover and let stand for 5 minutes. Whisk mixture gently until smooth then set aside to cool.
  3. Meanwhile, preheat the oven to 350°F. Butter and flour two 8-inch round cake pans.
  4. In a small bowl, whisk together the flour, sugars, salt, and baking soda.
  5. Whisk sour cream, oil, eggs, egg yolk, vinegar, and vanilla into the cooled chocolate mixture until smooth. Stir in the flour mixture until smooth, being careful not to overmix.
  6. Pour the batter into the prepared pans and bake for 35 to 40 minutes, or until a cake tester comes out clean. Cool in the pans for 30 minutes, then carefully turn them out onto a cooling rack to cool completely.
  7. Make the frosting:
  8. Combine the sugar, egg whites, and salt in the bowl of a stand mixer. Set bowl over a saucepan filled with 1-inch of gently simmering water. Whisking gently and constantly, heat mixture until sugar is dissolved and mixture is slightly thickened and foamy and registers 150°F on a candy thermometer or a digital thermometer, about 3 minutes.
  9. Fit stand mixer with whisk attachment and beat the egg white mixture on medium speed until slightly cooled and thickened, about 2 minutes. Add the butter, 1 piece at a time, until smooth and creamy. If the mixture looks curdled, that’s okay. Just keep beating until it becomes smooth. If the butter becomes too warm and greasy, refrigerate the bowl for 10 to 15 minutes then continue to beat until smooth.
  10. Add chocolate and vanilla and mix until combined. Increase speed to medium-high and beat until light, fluffy, and well combined, about 30 seconds, scraping down the sides of the bowl as necessary.
  11. Assemble:
  12. Place one cake layer on a cake turntable or cake stand. Spread an even layer of frosting all of the cake layer, pushing it out over the edge just slightly. Place the other cake layer upside-down on top of the frosting so that the top of the cake is nice and flat. With an offset spatula, spread the remaining frosting evenly all over the cake, smoothing the edges. Serve or cover and store in the fridge for up to 2 days. Let come to room temperature for an hour before serving.
  13. Recipe Notes
  14. If you don’t have espresso powder, you can use 1 cup hot coffee in place of the powder + boiling water. This recipe uses vegetable oil, make sure it’s fresh and doesn’t have an off smell before using.
This article and recipe adapted from this site
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