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9x13 buttermilk chocolate cake with chocolate frosting and sprinkles.
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5 from 2 votes

Buttermilk Chocolate Cake

This buttermilk chocolate cake is hands down one of the richest and most decadent cakes I've ever had! This is a 9x13 cake that's super easy to make and only requires unsweetened cocoa powder, so no fancy chocolate required! 
Prep Time10 mins
Cook Time28 mins
Total Time38 mins
Course: Dessert
Cuisine: American
Servings: 12
Calories: 488kcal


  • 2 cups all-purpose flour
  • 1/2 cup unsweetened cocoa powder sifted
  • 1 1/2 cups granulated sugar
  • 2 tsp baking powder
  • 1 tsp baking soda
  • 1 tsp salt
  • 3 eggs room temperature
  • 1 1/2 cups buttermilk
  • 1/2 cup sour cream
  • 1/2 cup vegetable oil
  • 1 tsp vanilla extract

Chocolate Buttercream

  • 8 tbsp unsalted butter softened
  • 2 1/3 cups powdered sugar
  • 3/4 cups unsweetened cocoa powder
  • 1/3 cup whole milk
  • 1 tsp vanilla extract


  • Preheat oven to 350 degrees F and grease a 9x13 baking dish.
  • Sift the flour, unsweetened cocoa powder, salt, baking powder, and baking soda. Set aside.
  • Using an electric mixer or a whisk, mix the vegetable oil, sour cream, eggs, buttermilk, vanilla extract, and sugar. Add the wet ingredients to the dry ingredients and mix until well combined.
  • Pour the cake batter into the baking dish and bake for 26-28 minutes. Allow the cake to cool completely before frosting.
  • To make the chocolate buttercream, mix the softened butter with an electric mixer until smooth. Add the powdered sugar, unsweetened cocoa powder, and vanilla extract. Mix for 1 minute and then add the milk. Mix for 3-4 minutes or until fluffy.
  • Frost the cake and decorate with sprinkles, if desired. Enjoy!


  • Use a good quality unsweetened cocoa powder since it's the main ingredient.
  • Please use room-temperature eggs and softened unsalted butter.
  • Allow the cake to cool completely before frosting.
  • Don't like sprinkles? Use chocolate chips to decorate the cake instead.


Calories: 488kcal | Carbohydrates: 72g | Protein: 7g | Fat: 22g | Saturated Fat: 15g | Trans Fat: 1g | Cholesterol: 70mg | Sodium: 347mg | Potassium: 308mg | Fiber: 4g | Sugar: 50g | Vitamin A: 413IU | Vitamin C: 1mg | Calcium: 105mg | Iron: 3mg