4.6 from 5 votes
This intensely chocolaty Devil's Food Chocolate Cake with Chocolate Buttercream Frosting is a totally indulgent dessert. The cake is rich and moist with a tender crumb and it's a chocolate lover's dream. Especially with my favorite chocolate buttercream frosting slathered generously between the layers and around the outside - no fancy piping or decorating skills required!
Devil's Food Chocolate Cake with Chocolate Frosting
Prep Time
15 mins
Cook Time
25 mins
Total Time
40 mins
 

This intensely chocolaty Devil's Food Chocolate Cake with Chocolate Buttercream Frosting is a totally indulgent dessert.  The cake is rich and moist with a tender crumb and it's a chocolate lover's dream.  Especially with my favorite chocolate buttercream frosting slathered generously between the layers and around the outside - no fancy piping or decorating skills required!

Course: Dessert
Cuisine: American
Servings: 12
Calories: 742 kcal
Ingredients
Devil's Food Chocolate Cake
  • 1/3 cup cocoa powder
  • 4 ounces bittersweet or semisweet chocolate, finely chopped
  • 1 cup boiling water
  • 2 teaspoons vanilla
  • 1 cup buttermilk
  • 1/2 cup butter, softened
  • 1/2 cup vegetable oil
  • 1 cup firmly packed dark brown sugar
  • 1 cup granulated sugar
  • 3 large eggs, at room temperature
  • 2 1/4 cups cake flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
Chocolate Buttercream Frosting
  • 1 cup unsalted butter, softened
  • 3 1/2 cups powdered sugar
  • 1/2 cup cocoa powder
  • 1/2 teaspoon salt (if using salted butter, reduce to 1/4 teaspoon of salt)
  • 2 teaspoons vanilla
  • 4-5 tablespoons whole milk or heavy cream
Instructions
Devil's Food Chocolate Cake
  1. Preheat the oven to 350 degrees. Prepare two round cake pans by cutting circles of parchment paper to line the bottoms, then lightly spray the insides of the pans with cooking spray.
  2. Combine the cocoa powder and finely chopped chocolate in a large bowl. Pour the boiling water over the chocolate and stir until the chocolate is completely melted, then add in the vanilla. Let this cool for a few minutes before stirring in the buttermilk.
  3. In the large bowl of a stand mixer, beat the butter and oil together for 1 minute. Add the dark brown and granulated sugars and beat for another 2-3 minutes, until light and creamy. Scrape down the sides of the bowl and add in the eggs, one at a time, beating well after each addition and scraping down the sides of the bowl.
  4. In a separate bowl, sift together the flour, baking soda and salt. Add half of this to the batter and mix on low speed just until combined. Pour in half of the chocolate-buttermilk mixture and mix again, just until combined, then repeat with the flour and the remaining chocolate-buttermilk mixture, scraping down the sides of the bowl between additions, until everything is incorporated.
  5. Divide the batter between the two prepared cake pans and bake for 25 to 30 minutes, or until a toothpick or cake tester comes out clean. Be sure not to overbake.
  6. Transfer the cakes to wire racks and allow them to cool completely before assembling the cake with frosting.
Chocolate Buttercream Frosting
  1. In a large bowl, cream the butter for 2 minutes using an electric mixer. Add the powdered sugar and cocoa powder and mix again at the lowest speed until combined.
  2. Add the salt, vanilla and milk or cream and increase the speed to medium, mixing until the chocolate buttercream is light and fluffy, about 3 minutes. For a softer frosting, increase the milk or cream by small increments., half a tablespoon at a time. Makes enough to very generously frost a two-layer cake.
Recipe Notes

If you don't have cake flour on hand, just replace 1/4 cup of the flour with 1/4 cup of cornstarch instead.

Nutrition Facts
Devil's Food Chocolate Cake with Chocolate Frosting
Amount Per Serving
Calories 742 Calories from Fat 342
% Daily Value*
Total Fat 38g 58%
Saturated Fat 25g 125%
Cholesterol 110mg 37%
Sodium 538mg 22%
Potassium 247mg 7%
Total Carbohydrates 96g 32%
Dietary Fiber 3g 12%
Sugars 73g
Protein 7g 14%
Vitamin A 16.4%
Calcium 7.5%
Iron 11.1%
* Percent Daily Values are based on a 2000 calorie diet.