Old Fashioned Chocolate Sheet Cake

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Old Fashioned Chocolate Sheet Cake is all about the icing. It’s made with real butter, cocoa, milk, powdered sugar, and vanilla.

Plus, this cake is deliciously dense and luscious all at the same time. It’s a little slice of heaven on a plate!

chocolate frosting being poured on top of a hot chocolate cake

Why You’ll Love This Recipe

I never knew Miss Beryl, but she made the best chocolate sheet cake around. Her daughter, Joann, shared her vintage recipe with me. After I took one bite, I knew I had to share it with you. I know this Old Fashioned Chocolate Sheet Cake will be one of your favorite desserts too!

This chocolate cake is so rich and decadent you won’t be able to stop eating it! Every bite will remind you of a cake your Grandma made back in the day.

Did I say it was made with lots of chocolate? Enough said.

chocolate sheet cake with a server in a white dish

How to Make Chocolate Cake

STEP 1: In a large mixing bowl, add 2 cups sugar, 2 cups self-rising flour, and 4 Tbsp. cocoa. Mix together and set aside.

STEP 2: In a saucepan, add 1 stick of butter, 1 cup oil, and 1 cup water. Bring to a boil for 1 minute, then pour over the dry ingredients in the mixing bowl. Beat dry and wet ingredients together for 1 minute on medium speed with a mixer.

STEP 3: In a separate bowl, whisk 2 eggs and 1/2 cup buttermilk. Pour into the mixing bowl with the rest of the ingredients and beat for 1 minute on medium speed until everything is combined.

STEP 4: Pour batter into a greased and floured 13 X 9 inch sheet pan or dish. Bake at 350 for 35 minutes.

chocolate cake batter being poured into a white pan

How to Make Chocolate Icing

STEP 1: In a separate saucepan, mix 1 stick butter, 3 Tbsp. cocoa and 4 Tbsp. milk together. Boil for 1 minute. Mix well and remove from heat.

STEP 2: Add 1 lb. powdered sugar and 1 teaspoon of vanilla and blend with a mixer until smooth. If icing is too thick, add tiny teaspoons of milk until it is shiny. Taste the icing and if it’s too grainy, blend it with a mixer until it becomes smooth and creamy.

STEP 3: Pour icing over cake starting at the edges and working towards the middle until it covers the top of cake. Allow icing to cool before serving.

slice of chocolate cake on a blue plate with a bite on a fork

What if I Can’t Find Self-Rising Flour?

Self-rising flour is a staple in the south, but if you can’t find it in your location, here’s how you make it! Just substitute the following ingredients for self rising flour in this recipe.

  • 2 cups all purpose flour
  • 1 Tablespoon baking powder
  • 1/2 tsp. salt
chocolate cake in a pan with a server on a blue napkin

More Chocolate Desserts

Do you love chocolate as much as I do? If so, try these other chocolate goodies from my recipe box…

chocolate frosting being poured on top of a hot chocolate cake

Old Fashioned Chocolate Sheet Cake

Old Fashioned Chocolate Sheet Cake is the best you've ever tasted. It's dense, luscious, and topped with a decadent chocolate icing. 
5 from 9 votes
Print Pin Rate
Course: Desserts
Cuisine: American
Prep Time: 30 minutes
Cook Time: 35 minutes
Total Time: 1 hour 5 minutes
Servings: 12
Calories: 540kcal

*See notes in blog post for detailed tips, photos and instructions.

Ingredients

CHOCOLATE CAKE

  • 2 cups sugar
  • 2 cups self-rising flour
  • 4 Tablespoons cocoa
  • 1 stick butter
  • 1 cup vegetable oil
  • 1 cup water
  • 2 large eggs
  • ½ cup buttermilk

CHOCOLATE ICING

  • 1 stick butter
  • 3 Tablespoons cocoa
  • 4 Tablespoons milk
  • 1 pound box powdered sugar 4 cups
  • 1 teaspoon vanilla

Instructions

CHOCOLATE CAKE

  • Preheat oven to 350 degrees.
  • In a mixing bowl, add sugar, flour and cocoa.  Stir and set aside.
  • Boil butter, oil and water in a saucepan for 1 minute. Pour contents into dry ingredients in mixing bowl. Blend with a mixer on medium speed for 1 minute.
  • In a separate bowl, whisk eggs and buttermilk together.  Pour into contents in mixing bowl.
  • Mix batter for 1 minute on medium speed until combined.
  • Pour batter into a 13 X 9 inch greased and floured pan.
  • Bake at 350 degrees for 35 minutes.

CHOCOLATE ICING

  • In a saucepan, mix melted butter, cocoa and milk together.  Boil for 1 minute.  Remove from heat.
  • Add powdered sugar and vanilla.  Blend with a mixer on medium speed until creamy and smooth.
  • If icing is too thick, add tiny amounts of milk until icing is shiny.
  • Taste icing.  If it is grainy, blend with a mixer on high speed until smooth.
  • Pour icing over hot cake, starting at edges and working towards middle until cake is completely covered. 
  • Cool for 30 minutes before serving. 

Notes

Use a mixer to make the icing or it will not set up properly. 

Nutrition

Calories: 540kcal | Carbohydrates: 89g | Protein: 4g | Fat: 20g | Saturated Fat: 4g | Sodium: 27mg | Potassium: 97mg | Fiber: 1g | Sugar: 71g | Calcium: 29mg | Iron: 1mg

Nutrition info is an auto generated estimate.

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22 Comments

  1. 5 stars
    This is one of my families’ favorite cakes! I think I have made this cake over 20 times since you posted this recipe! I remember having this cake at my grandmothers but never had the recipe. Thank you for sharing my friend!

  2. Some recipes call for baking soda to offset the acid in the coco powder and/or buttermilk. I don’t understand why this one doesn’t?
    Also could you substitute Kefir for Buttermilk?

    1. Hi Charlene. This is an old fashioned recipe handed down through the years. It calls for self rising flour which already comes with the proper measurement of baking powder and salt. It works perfectly without the baking soda. I have never tested it with Kefir so I can’t guarantee the results.

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