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Home » Recipes » Homemade Chocolate Brownie Cake Recipe

Homemade Chocolate Brownie Cake Recipe

Published: Sep 23, 2017 · Modified: Dec 27, 2022 by Lynda · This post may contain affiliate links.

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This homemade Chocolate Brownie Cake recipe creates a delicious hybrid of chocolate brownies and a Texas sheet cake. The cake is topped with luscious chocolate icing made from scratch.

Sliced chocolate brownie cake and a metal spatula.
Jump to:
  • 🥘 Ingredients
  • 🔪How To Make a Chocolate Brownie Cake
  • ⏲️ Baking Time
  • 📖 Recipe

Most brownie recipes only make an 8×8 or 9×9 batch. I came up with this Homemade Chocolate Brownie Cake in order to make a larger batch.

I combined some elements of a few recipes, tweaked them a little, and bam! These chocolate brownies are what some may call a Brownie Sheet Cake.

Mound of cocoa powder and sugar on a white background.

🥘 Ingredients

To make a 9×13 pan of chocolate brownie cake from scratch, you need the following ingredients:

Chocolate Syrup

  • ¼ cup unsweetened cocoa powder
  • ½ cup water
  • 1 cup sugar
  • 1 teaspoon vanilla
  • ¼ teaspoon salt

Brownie Cake Batter

  • 1½ cups all-purpose flour
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 2 tablespoons espresso powder
  • 10 tablespoons butter (= 1 stick + 2 tablespoons)
  • ¾ cup baking cocoa
  • ¼ cup vegetable oil
  • 2 cups sugar
  • 4 large eggs
  • 2 teaspoons vanilla extract
  • ⅔ cup chocolate chips
  • Chocolate Syrup

Chocolate Icing

  • 1¼ cups chocolate chips
  • 3 tablespoons corn syrup
  • 1 stick butter

🔪How To Make a Chocolate Brownie Cake

Start off by making a simple chocolate syrup. Just sugar, cocoa, water, vanilla, and a little salt.

Boiling chocolate in a small saucepan.

The reason to make the syrup first is that it has to come to a boil and then cool. It will thicken some during the cooling period.

While the syrup is cooling, start the other aspects of the brownies, like preparing a 9×13 pan. I like to line it with aluminum foil that has been sprayed with non-stick spray.

All-purpose flour and espresso in a glass bowl.

Next, gather the other ingredients together. (Above is flour, baking powder, salt, and espresso powder.)

Eggs in a small glass bowl.

It’s best to add eggs one at a time. I like to crack all of mine into a little glass bowl before adding them. You never know when you will run across a bad egg.

Now, microwave the butter until it is melted in a medium-size glass bowl. Add cocoa and oil and whisk until smooth.

Transfer the cocoa mixture to a bowl of an electric mixer. Stir in the sugar and add eggs, one at a time, mixing well after each addition. Add vanilla.

Gradually add the flour mixture. Pour in chocolate syrup and chocolate chips.

Brownie batter on a whisk attachment in a mixing bowl.

⏲️ Baking Time

Pour batter into prepared 13×9 pan and bake for 25-30 minutes or until done. Let cool before icing.

Baked brownie cake without icing.

This is how it looks before the icing is added.

Chocolate chips in a glass bowl with a stick of butter.

The icing is a simple chocolate glaze made with chocolate chips, butter, and a little corn syrup.

To make the icing, melt chocolate chips and butter together in a microwave-safe bowl in 30-second intervals on high, stirring well after each segment. (It took me a total of one minute + an additional 10 seconds.)

Add corn syrup and stir until smooth. Let sit for 5 minutes before pouring over brownies.

📖 Recipe

Sliced chocolate brownie cake and a metal spatula.

Chocolate Brownie Cake

Chocolate Brownie Cake – this dessert recipe is so good. It's a mix between a brownie and chocolate sheet cake. Yum!
4.59 from 48 votes
Print Pin Rate
Course: Desserts
Cuisine: American
Prep Time: 15 minutes
Cook Time: 40 minutes
Total Time: 55 minutes
Servings: 16 slices
Calories: 492kcal
Author: Lynda

Ingredients

Chocolate Syrup

  • ¼ cup unsweetened cocoa powder
  • ½ cup water
  • 1 cup sugar
  • 1 teaspoon vanilla
  • ¼ teaspoon salt

Brownie Batter

  • 1½ cups all-purpose flour
  • 1 teaspoon baking powder
  • 1 teaspoon salt
  • 2 tabelspoons espresso powder
  • 10 Tablespoons butter (1 stick + 2 tablespoons)
  • ¾ cup baking cocoa
  • ¼ cup vegetable oil
  • 2 cups sugar
  • 4 large eggs
  • 2 teaspoons vanilla extract
  • ⅔ cups chocolate chips
  • Chocolate Syrup

Chocolate Icing

  • 1¼ cups chocolate chips
  • 3 tablespoons corn syrup
  • ½ cup butter (1 stick)

Instructions

  • To make the syrup: in a medium or large saucepan, whisk the cocoa powder and sugar until well blended. Add water and whisk over medium-high until it starts to boil and becomes a little frothy. Continue boiling for approximately 3 minutes. Reduce heat and allow to simmer for 2 more minutes. Remove from the heat and add salt. Let cool.
  • Preheat oven to 350 degrees. Line bottom of 13×9 pan with aluminum foil and spray with non-stick cooking spray.
  • Combine flour, baking powder, salt, and espresso powder and set aside.
  • Microwave butter until melted in a medium size glass bowl. Add cocoa and oil and whisk until smooth.
  • Transfer cocoa mixture to a bowl of an electric mixer. Stir in sugar. Add eggs, one at a time, mixing well after each addition. Add vanilla. Gradually add flour mixture. Pour in chocolate syrup and chocolate chips.
  • Pour batter into prepared 13×9 pan and bake for 25-30 minutes or until done. Let cool before icing.
  • To make the icing: Melt chocolate chips and butter together in a microwave-safe bowl in 30 second intervals on high, stirring well after each segment. (It took me a total of one minute + an additional 10 seconds.) Add corn syrup and stir until smooth. Let sit for 5 minutes before pouring over brownies.

Video

Nutrition

Serving: 1slice | Calories: 492kcal | Carbohydrates: 68g | Protein: 5g | Fat: 24g | Saturated Fat: 13g | Polyunsaturated Fat: 10g | Trans Fat: 1g | Cholesterol: 81mg | Sodium: 340mg | Fiber: 3g | Sugar: 53g
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Iced brownie cake in a foil lined baking pan.

Like chocolate? Be sure to check out these other delicious chocolatey desserts:

  • Nutella Bread (aka Chocolate Bread) – Luscious Nutella enrobed in a homemade sweet dough – it’s great for breakfast, snack, and dessert!
  • Brown Sugar Blondies – This is the recipe for those who really want a brownie but can’t have chocolate.

More Get Cooking With Our Delicious Recipes!

  • Southern Chocolate Gravy Recipe
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    Recipe Rating




  1. Kathy Graziano says

    March 16, 2022 at 4:35 pm

    can you use fondant frosting on it need to decorate for a school project

    Reply
    • Lynda says

      March 16, 2022 at 4:48 pm

      You probably could. If my child had a school project, I think I would just use a box of cake mix to keep expenses down rather than make this from scratch.

      Reply
  2. doris stuart says

    January 08, 2022 at 3:54 pm

    well the brownie cake looks good but i would what the one person did was omitt the espresso powder but i wouldnt add anything in place of it. dont drink coffee and dont like the stuff with with coffee in it. and i woud make my own frosting to put on it . thanks

    Reply
  3. Jeanne B says

    July 20, 2020 at 10:14 am

    I made these and they were excellent! I did make two changes though. I don’t drink coffee, so I used onyx powder instead, it’s a very dark cocoa powder, like in Oreo cookies. Also, I was in a hurry so I substituted a layer of Nutella for the icing on top, which turned out delicious, of course, and softened the dark intensity of the brownies in a good way. Everyone gobbled these bad brownie boys up!

    Reply
    • Lynda says

      July 20, 2020 at 10:47 am

      Thanks, Jeanne, for stopping by and leaving your comment. It made me happy to hear that they disappeared!

      Reply
  4. Jolene says

    July 01, 2020 at 1:18 am

    Made this recipe, a little over the top with all the sugar oil and butter and the taste wasn’t as good as I was hoping for.

    Reply
    • Lynda says

      July 02, 2020 at 6:41 pm

      Thanks for stopping by and leaving a comment. I hate that they were not what you were hoping for. Honestly, at this stage in my life, I probably would find them too sweet and too rich.

      Reply
  5. Grace says

    April 14, 2020 at 8:33 pm

    Thank you for this recipe! I made these this week ( we added pecans to the icing) and it’s been hands down the best brownies I’ve ever made. Thanks!

    Reply
    • Lynda says

      April 15, 2020 at 6:57 am

      Your comment makes my heart happy! Thank you so much for sharing. I am so delighted you like the recipe. <3

      Reply
  6. Chris says

    January 03, 2020 at 1:40 pm

    Looks amazing. Can’t wait to try them. How much instant coffee instead of expresso?
    Thanks

    Reply
    • Lynda says

      January 04, 2020 at 3:38 pm

      I would double the amount.

      Reply
  7. Ethel Anderson says

    June 04, 2019 at 9:36 am

    Would like to bake in a larger sheet cake pan would this work

    Reply
    • Lynda says

      June 05, 2019 at 6:24 am

      I am not sure. If you were to do that, you would have to adjust the baking time and/or temperature.

      Reply
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Lynda and Johnny statue

My name is Lynda and I am a recovering sugar addict and travel junkie. I'm also a mom of two children & 2 dogs, wife of 1....and a messy cook taking life one bite at a time.

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