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5 from 7 votes

Best Ever One Bowl Chocolate Cake

This Best Ever One Bowl Chocolate Cake is the 'holy grail' of chocolate cakes! It's soft and tender with a deep chocolate flavour, and it's perfect for frosting!
Course Dessert
Cuisine Baking
Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 12 servings
Calories 477kcal
Author Chrissie Baker (thebusybaker.ca)


  • 1 1/2 cups white sugar
  • 1 3/4 cups all purpose flour
  • 3/4 cup unsweetened cocoa powder
  • 1 1/2 teaspoons baking powder
  • 1 1/2 teaspoons baking soda
  • 3/4 teaspoon salt
  • 2 eggs
  • 1 cup milk
  • 1/2 cup vegetable oil
  • 2 teaspoons vanilla
  • 1 cup boiling water
  • 3/4 cup unsalted butter at room temperature
  • 4 tablespoons unsweetened cocoa powder
  • 2 1/2 cups powdered sugar
  • 1 tablespoon milk (optional to thin out the frosting if necessary)


  • Preheat your oven to 350 degrees Fahrenheit.
  • In a large bowl, whisk together the sugar, flour, cocoa powder, baking powder, baking soda and salt until well combined.
  • Add the eggs, the milk, the vegetable oil and the vanilla, and whisk these ingredients into the dry ingredients until the mixture is smooth.
  • Slowly add the boiling water, whisking constantly until the cake batter is runny and smooth.
  • Pour the cake batter into a greased 9-inch by 13-inch rectangular pan and bake at 350 degrees Fahrenheit for about 30 minutes, or until a toothpick inserted into the middle of the cake comes out clean.
  • Let the cake cool in the pan on a wire rack while you make the frosting.
  • For the frosting, whip the butter on high speed using a stand mixer or electric hand mixer until the butter is pale and smooth. Add the cocoa powder and the powdered sugar and continue to whip until everything is combined and smooth.
  • If necessary, add the milk a few drops at a time to loosen up the frosting until it reaches a consistency that is spreadable. This step may not be necessary depending on the temperature of the butter you used for the frosting.
  • When the cake has cooled completely, spread the frosting over the cake.
  • Refrigerate the cake for about 1 hour to allow the frosting to set before serving, or serve immediately if you desire.


- This cake is great for potlucks or taking to family get-togethers because it serves a large number of people.
- If you're looking for a quick dessert, just forget the frosting and dust the top of the cake with some powdered sugar to save time. It's just as delicious!


Serving: 1serving | Calories: 477kcal | Carbohydrates: 69g | Protein: 5g | Fat: 22g | Saturated Fat: 16g | Cholesterol: 58mg | Sodium: 307mg | Potassium: 223mg | Fiber: 3g | Sugar: 51g | Vitamin A: 436IU | Calcium: 67mg | Iron: 2mg