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Homemade Chocolate Layer Cake

A rich and moist homemade chocolate layer cake featuring tender chocolate cake layers and a creamy chocolate buttercream frosting, perfect for any celebration.

Ingredients

Scale
  • 1 cup (2 sticks) unsalted butter, room temperature
  • 2 1/2 cups granulated sugar
  • 4 large eggs, room temperature
  • 1 cup hot water
  • 1 cup buttermilk, room temperature
  • 1 cup dark or black cocoa powder
  • 3 cups all-purpose flour
  • 1 1/2 teaspoons baking powder
  • 1 teaspoon baking soda
  • 1 teaspoon fine salt
  • For the Chocolate Buttercream Frosting:
  • 2 cups (4 sticks) unsalted butter, room temperature
  • 1 cup unsweetened baking cocoa, sifted
  • 1/2 teaspoon fine salt
  • 6 cups powdered sugar
  • 1/2 cup heavy whipping cream, room temperature
  • 1 1/3 cups melted dark chocolate, cooled

Instructions

  1. Preheat oven to 350°F (175°C). Grease and line four 7-inch or three 8-inch cake pans with parchment paper. Set aside.
  2. In a large bowl or stand mixer, beat 1 cup unsalted butter until smooth and creamy. Add 2 1/2 cups sugar and beat on high speed for 1-2 minutes until light in color, scraping sides as needed.
  3. Add eggs one at a time, mixing well after each addition.
  4. Mix cocoa powder into hot water until smoothly combined, then add to the butter mixture alternating with buttermilk and dry ingredients (flour, baking powder, baking soda, salt), beginning and ending with dry ingredients. Mix until just combined.
  5. Divide batter evenly among prepared pans and bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
  6. Cool cakes in pans for 10 minutes, then turn out onto wire racks to cool completely.
  7. For the frosting, beat 2 cups butter until creamy. Add cocoa powder and salt, mix well.
  8. Gradually add powdered sugar alternately with heavy cream, beating on medium speed until fluffy.
  9. Mix in melted dark chocolate until fully incorporated.
  10. Assemble the cake by spreading frosting between layers and over the top and sides. Chill slightly before serving for best texture.

Notes

Use buttermilk at room temperature for best texture. Ensure eggs are also at room temperature before mixing. For a deeper chocolate flavor, use black cocoa powder. Cake layers can be baked a day ahead and wrapped tightly. Frosting can be adjusted for thickness by adding more powdered sugar or cream as needed.

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