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A one bowl chocolate cake with chocolate buttercream and sprinkles sheet cake on a gray background.

One Bowl Chocolate Cake with Chocolate Buttercream

This one bowl chocolate cake is one of my ultimate favorite recipes! It's so incredibly easy to whip up and makes the most fluffy, chocolatey cake ever. 
5 from 3 votes
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Course: Cake, Dessert
Cuisine: American
Keyword: chocolate birthday cake, chocolate buttercream, chocolate cake, easy chocolate cake, fluffy chocolate cake, one bowl chocolate cake, the best one bowl chocolate cake
Prep Time: 10 minutes
Cook Time: 35 minutes
Total Time: 1 hour
Servings: 8 -10 people
Calories: 463kcal
Author: Sam Adler


For the cake:

  • Baking spray for pan
  • 3 cups granulated sugar
  • 3 cups all purpose flour
  • 1 ½ cups unsweetened cocoa powder
  • 1 tablespoon baking soda
  • 1 ½ teaspoon baking powder
  • 1/4 teaspoon kosher salt
  • 4 large eggs
  • 1 ½ cups milk or soy milk
  • 1 tablespoon vanilla extract
  • 1 ½ cups brewed black coffee plus 1 tbsp for the buttercream
  • ½ cup vegetable oil

For the Chocolate Buttercream:

  • 1 cup unsalted butter or vegan butter softened at room temperature
  • 3 cups confectioners sugar
  • cup unsweetened cocoa powder
  • 1 tablespoon brewed black coffee
  • 1 teaspoon milk or soy milk


Make the cake: 

  • Preheat your oven to 350° F and spray a 9x13” or 3- 8” round pans with baking spray.
  • In the bowl of a stand mixer fitted with the paddle attachment, add the sugar, flour, cocoa powder, baking soda, baking powder, and salt, and mix on low till combined.
  • Add the eggs one at a time, incorporating them into the mix before each addition.
  • Raise the speed up to medium and in a steady stream add in the milk and vanilla.
  • Mix until combined. Stop the mixer and scrape down the sides to make sure it is evenly mixed.
  • With the mixer running on medium again, add in the coffee and oil slowly.
  • Continue mixing until the batter is evenly mixed, it is a runny batter!
  • Pour into the prepared pan and bake for 30-35 mins, or until the edges of the cake break away from the pan, or a skewer inserted in the middle comes out clean.
  • Cool.

Make the buttercream: 

  • In the bowl of a stand mixer fitted with the paddle attachment, add in the butter, confectioners sugar and cocoa and mix on medium speed until combined.
  • Add in the coffee, and milk and continue to mix on medium speed. You may have to scrape down the bowl once or twice to mix it well.
  • Frost cake, then decorate with sprinkles and enjoy!


This cake can be made into a layer cake using three 9-inch round cake pans


Nutrition Facts
One Bowl Chocolate Cake with Chocolate Buttercream
Amount Per Serving (1 g)
Calories 463 Calories from Fat 171
% Daily Value*
Fat 19g29%
Saturated Fat 8g50%
Polyunsaturated Fat 10g
Cholesterol 70mg23%
Sodium 236mg10%
Carbohydrates 72g24%
Fiber 2g8%
Sugar 56g62%
Protein 5g10%
* Percent Daily Values are based on a 2000 calorie diet.