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Brownie Cake

Brownie cake with chocolate frosting

Brownie cake is a rich, decadent, and incredibly easy cake to make.

The dense, chocolatey, fudgy cake is made out of two boxed mixes and only a few ingredients, and it creates a cake that you will want to make over and over again.

Chocolate brownie cake is part of #Summerdessertweek 2020, so be sure to read through the steps, grab the recipe, and check out all of the other recipes at the bottom of the post for this year’s event.

Brownie cake sitting on a white platter.

You really couldn’t ask for an easier dessert cake to make. It turns out dense, moist, and absolutely divine. And, it’s topped with a rich and super easy chocolate frosting.

My son told me it was the perfect cake, but I should have doubled the amount of frosting because he loved it so much.

What Do I Need To Make the Brownie Cake Recipe?

Cake:

Frosting:

  • Butter, melted
  • Powdered sugar
  • Unsweetened cocoa powder
  • Vanilla extract
  • Water

Full printable recipe with measurements and directions listed at the bottom of the post.

How Do I Make the Brownie Cake?

  1. For the cake, add the cake and brownie mixes to a large bowl.
  2. Next, add the water, vegetable oil, and eggs, and mix well.
  3. Pour into a greased bundt pan and bake for about 55 minutes or until a cake tester comes out clean.
  4. For the frosting, add the powdered sugar and unsweetened cocoa to a medium-sized bowl.
  5. Next, add the melted butter, warm water, and vanilla extract and mix until well blended.
  6. Pour over the cake and serve.

Brownie Cake Recipe

Chocolate Cake mix in a glass bowl.

Start the recipe by adding the boxed cake mix to a large bowl.

Dry brownie and cake mix in a glass bowl

Next, add the boxed brownie mix to the bowl.

Pouring vegetable oil into a brownie cake mix.

Pour the vegetable oil into the bowl.

Pouring water into a brownie cake mix.

Now, pour the water into the bowl.

Eggs, water, oil, brownie, and cake mix in a glass bowl.

Add the eggs to the bowl and mix well.

Chocolate cake in a bundt pan

Pour the cake into a greased bundt cake pan and bake for 55 minutes or until a cake tester comes out clean.

When the brownie cake is done baking, allow it to cool for at least 20 minutes. The cake will pull away from the sides as it bakes, making it a little easier to get it out of the pan.

I always take a knife and slide it down the sides and in the center of the pan to make sure it’s not sticking to the sides.

I then place a cake stand or a plate over the top and flip it over. It should come out easily.

Now, you can get started on your frosting.

Homemade Chocolate Frosting

Powdered sugar and cocoa in a glass bowl.

Start by adding the powdered sugar and the unsweetened cocoa to a medium-sized bowl.

Pouring vanilla into a bowl for chocolate frosting.

Next, pour the vanilla extract into the bowl.

Pouring melted butter into a glass bowl with frosting ingredients.

Followed by the melted butter.

Pouring water into a glass bowl for frosting.

And finish with the warm water. Then mix everything together and pour it on the cake.

TIP: Start off with two tablespoons of warm water. If the frosting is too thick, add another tablespoon of water and mix.

Pouring chocolate frosting over a brownie cake.

The frosting covers quite a bit of the cake, but if you’d like to completely cover it, you can double the recipe.

Pouring chocolate frosting on top of a brownie cake.
A slice of chocolate brownie cake on a white plate.
Chocolate Brownie Cake on a cake pedestal.
Yield: 24 pieces

Brownie Cake

Brownie cake with chocolate frosting

Brownie cake is a rich, decadent, and incredibly easy cake to make.

Prep Time 15 minutes
Cook Time 55 minutes
Additional Time 20 minutes
Total Time 1 hour 30 minutes

Ingredients

Cake

  • 1 - 15.25 oz. box chocolate cake mix
  • 1 - 18 oz. box brownie mix
  • 1-1/4 cups water
  • 1 cup vegetable oil
  • 4 eggs

Chocolate frosting

  • 1-1/4 cups powdered sugar
  • 3 Tbsp. unsweetened cocoa powder
  • 2 Tbsp. melted butter
  • 2 Tbps. warm water (add more if too thick)
  • 1-1/2 tsp. vanilla extract

Instructions

Brownie Cake

  1. Preheat the oven to 350-degrees and grease a bundt cake pan.
  2. Start by adding the box cake and brownie mixes to a large bowl.
  3. Add the vegetable oil, water, and eggs and mix well.
  4. Pour the batter into the bundt pan and bake for approximately 55 minutes, or until a cake tester comes out clean.

Chocolate Frosting

  1. Add the powdered sugar and unsweetened cocoa to a medium-sized bowl.
  2. Next, add the melted butter, vanilla extract, and water, and mix until well blended.
  3. Pour over the cooled cake.

Notes

TIP: Start by adding two tablespoons of water to the frosting. If the frosting is too thick, add more water to thin the recipe.

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Nutrition Information:

Yield:

24

Serving Size:

1

Amount Per Serving: Calories: 338Total Fat: 16gSaturated Fat: 2gTrans Fat: 0gUnsaturated Fat: 12gCholesterol: 34mgSodium: 225mgCarbohydrates: 50gFiber: 1gSugar: 25gProtein: 3g

Nutrition is approximate.

Did you make this recipe?

Please leave a comment on the blog or share a photo on Pinterest

  Welcome to the 4th Annual #SummerDessertWeek event hosted by Angie from Big Bear’s Wife. We’re celebrating all things summer with a week-long event that is absolutely filled with some of the best summer dessert recipes! Follow the hashtag #SummerDessertWeek on social media to find recipes and make sure to check out the bottom of this post for even more summer desserts!   Check out the amazing #SummerDessertWeek recipes from our bloggers today! Ice Cream & Chilled Desserts: Sweet Summertime Cakes and Cupcakes: No Bake Treats: Baked Desserts:

Grab some more delicious recipes at Julia’s Simply Southern and South Your Mouth.

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Christie Campbell

Saturday 25th of July 2020

Brownie + cake = quarantine 30! Holy moly that looks insanely delicious.

Julie Pollitt

Saturday 25th of July 2020

Ha ha! Love it!

Dennis Yannakos

Tuesday 14th of July 2020

It's rich in moisture and I never get sick of eating it! Best Kitchen Utensils

Carlee

Tuesday 14th of July 2020

This looks so good and easy to make too! After a long love affair with layer cakes, I am falling back in love with bundts!

Julie Pollitt

Tuesday 14th of July 2020

Thanks, Carlee! Layer cakes are a wonderful treat, for sure.