Dark Chocolate Sheet Cake

Indulge in the rich, velvety decadence of this Dark Chocolate Sheet Cake—a timeless treat for chocolate lovers. This moist and tender cake pairs the deep, bold flavor of unsweetened cocoa with a touch of buttermilk for a perfectly balanced sweetness. Topped with a luscious homemade chocolate frosting made from melted butter and cocoa powder, every bite is pure dessert bliss. Easy to make in just under an hour, this one-pan marvel is ideal for celebrations, potlucks, or simply satisfying your sweet tooth. Serve it sliced into generous squares and watch it disappear in no time! Perfect for lovers of chocolate cakes, simple baking, and crowd-pleasing desserts, this recipe is guaranteed to impress.

Nutriscore Rating: 50/100

Prep Time:20 mins

Cook Time:35 mins

Total Time:55 mins

Servings: 12

Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 0.75 cup unsweetened cocoa powder
• 2 teaspoons baking powder
• 1.5 teaspoons baking soda
• 1 teaspoon salt
• 1 cup buttermilk
• 0.5 cup vegetable oil
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 cup boiling water
• 1 cup unsalted butter (for frosting)
• 0.67 cup unsweetened cocoa powder (for frosting)
• 3 cups powdered sugar (for frosting)
• 0.33 cup milk (for frosting)
• 1 teaspoon vanilla extract (for frosting)

Directions

Step 1

Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking pan and set it aside.

Step 2

In a large bowl, whisk together the flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt.

Step 3

Add the buttermilk, vegetable oil, eggs, and vanilla extract to the bowl. Mix until the batter is smooth and well combined.

Step 4

Carefully stir in the boiling water. The batter will be thin; this is normal.

Step 5

Pour the batter evenly into the prepared baking pan.

Step 6

Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted into the center of the cake comes out clean.

Step 7

While the cake cools, prepare the frosting. Melt the unsalted butter in a medium saucepan over low heat.

Step 8

Stir in the cocoa powder until smooth and combined.

Step 9

Remove the saucepan from the heat and alternately add the powdered sugar and milk, beating until the frosting reaches a spreadable consistency.

Step 10

Stir in the vanilla extract.

Step 11

Once the cake is completely cooled, spread the frosting evenly over the top of the cake.

Step 12

Slice the cake into squares and serve. Enjoy!

Nutrition Facts

Serving size	(2398.0g)

Amount per serving	% Daily Value*
Calories	7644.3

Total Fat 365.5g	0%
Saturated Fat 172.6g	0%
Polyunsaturated Fat 67.7g
Cholesterol 922.1mg	0%
Sodium 5619.2mg	0%
Total Carbohydrate 1187.1g	0%
Dietary Fiber 134.6g	0%
Total Sugars 797.0g
Protein 117.5g	0%

Vitamin D 366.5IU	0%
Calcium 930.6mg	0%
Iron 58.0mg	0%
Potassium 6066.0mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 38.7%

Protein: 5.5%

Carbs: 55.8%