Chocolate Sheet Cake With Cocoa

Name: Chocolate Sheet Cake With Cocoa
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Yield: 12 servings
Ingredients: 2 cups all-purpose flour; 2 cups granulated sugar; 1 cup unsweetened cocoa powder; 1.5 teaspoons baking soda; 1 teaspoon baking powder; 1 teaspoon salt; 2 large eggs; 1 cup whole milk; 0.5 cup vegetable oil; 2 teaspoons vanilla extract; 1 cup boiling water; 0.5 cup unsalted butter, softened; 0.5 cup unsweetened cocoa powder; 2 cups powdered sugar; 0.25 cup whole milk; 1 teaspoon vanilla extract

Highlighted under: Golden Food

I absolutely love making this Chocolate Sheet Cake With Cocoa because it’s not only quick and easy, but the rich flavor is simply irresistible. The velvety texture and deep chocolate taste make it a perfect treat for both casual gatherings and special occasions. What I enjoy most is how this cake remains soft and moist for days, if it lasts that long! Everybody in my family can't resist asking for seconds when I serve this cake, and I can’t blame them.

Created by

Elin Matthews

Last updated on 2026-02-14T22:25:37.009Z

When I first attempted to make this Chocolate Sheet Cake, I was surprised by how straightforward the process was. The key was all in mixing the ingredients thoroughly while still keeping the batter light and airy. I also found that letting the cake cool completely before frosting made all the difference for the perfect frosting finish.

After several attempts and tweaks to the recipe, I realized that using high-quality cocoa powder really elevates the flavor. Now, it's the go-to recipe for birthdays and potlucks. One secret I discovered is to add a pinch of salt to the frosting; it balances the sweetness beautifully!

Why You Will Love This Recipe

Rich, chocolatey goodness that's hard to resist
Quick and easy preparation, perfect for busy days
Moist and tender texture that stays fresh for days

Understanding the Ingredients

The quality of your cocoa powder significantly influences the flavor of this Chocolate Sheet Cake. I recommend using a high-quality unsweetened cocoa powder, as it provides depth and richness. If you want a deeper flavor, opt for Dutch-processed cocoa, though it will alter the cake’s final color and rise slightly. Additionally, ensure your baking soda and baking powder are fresh; if they're past their prime, they may not leaven the cake properly, resulting in a dense texture.

Using whole milk adds richness and moisture, giving the cake its tender crumb. If you need a dairy-free option, almond milk or oat milk can work as substitutes, but be cautious with flavored varieties as they may alter the cake's taste. The vegetable oil contributes to the cake’s moistness without adding any competing flavors, making it preferable over butter for this recipe.

Texture and Baking Tips

The texture of this cake is key to its appeal. By incorporating boiling water into the batter, you enhance the cocoa's flavor and ensure a moist crumb. It’s normal for the batter to be thin at this stage; this is what helps the cake stay moist even days later. When baking, keep an eye on the cake during the last few minutes. A toothpick should come out clean or with a few moist crumbs—if you wait too long, the cake may dry out.

Let the cake cool completely in the pan before frosting it. This can take about 30-45 minutes. If you frost while it’s still warm, the icing can melt and slide off, leading to a messy presentation. Once cool, I recommend using a spatula to evenly spread the frosting, allowing for a smooth, shiny finish that complements the rich chocolate flavor perfectly.

Ingredients

Gather these ingredients before you start your baking adventure.

Cake

2 cups all-purpose flour
2 cups granulated sugar
1 cup unsweetened cocoa powder
1.5 teaspoons baking soda
1 teaspoon baking powder
1 teaspoon salt
2 large eggs
1 cup whole milk
0.5 cup vegetable oil
2 teaspoons vanilla extract
1 cup boiling water

Frosting

0.5 cup unsalted butter, softened
0.5 cup unsweetened cocoa powder
2 cups powdered sugar
0.25 cup whole milk
1 teaspoon vanilla extract

Make sure you have everything ready to whip up this delicious cake!

Instructions

Follow these steps carefully to ensure a perfect cake every time.

Preheat the Oven

Preheat your oven to 350°F (175°C). Grease and flour a sheet cake pan.

Mix Dry Ingredients

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

Combine Wet Ingredients

Add the eggs, milk, oil, and vanilla extract to the dry mixture. Beat for 2 minutes on medium speed.

Incorporate Boiling Water

Stir in the boiling water carefully until the batter is well combined. It will be thin.

Bake the Cake

Pour the batter into the prepared pan and bake for 30 minutes, or until a toothpick comes out clean.

Make the Frosting

For the frosting, beat together the softened butter, cocoa powder, and powdered sugar. Add milk and vanilla; mix until smooth.

Frost the Cake

Allow the cake to cool completely, then frost evenly with the chocolate frosting.

Enjoy your delicious chocolate sheet cake!

Pro Tips

For an extra touch, you can add chocolate shavings or sprinkles on top of the frosting for decoration.

Storage and Make-Ahead Tips

This Chocolate Sheet Cake is perfect for making ahead of time. To store, cover it tightly with plastic wrap or place it in an airtight container at room temperature. It remains soft and moist for up to four days, making it a great option for birthday celebrations or unexpected guests. If you want to keep it longer, consider freezing the unfrosted cake. Wrap it well in plastic and then foil; it can last up to three months in the freezer.

To thaw, simply transfer it to the refrigerator overnight, then bring it to room temperature before frosting. This means you can prepare the cake in advance without worrying about it losing its delightful texture or taste. Just be sure to apply the frosting once thawed for the best results.

Serving Suggestions

This cake is versatile when it comes to serving. It pairs beautifully with a scoop of vanilla ice cream or a dollop of whipped cream, adding a delightful contrast to the rich chocolate flavors. For an extra touch, consider drizzling some chocolate or caramel sauce over the top before serving to elevate the presentation and flavor.

If you're feeling creative, you can add toppings such as sprinkles, crushed nuts, or fresh berries to introduce texture and visual appeal. The cake stands perfectly as is, but these additions can take it from simple to sensational for special occasions. Keep in mind that personal touches can make this cake even more memorable for your guests.

Questions About Recipes

→ Can I substitute the cocoa powder?

Yes, you can use Dutch-processed cocoa powder for a milder flavor.

→ How do I store the cake?

Keep it covered at room temperature for up to 3 days or in the fridge for a week.

→ Can I make this cake ahead of time?

Absolutely! You can bake it a day in advance and frost it just before serving.

→ What is the best way to serve this cake?

Slice and serve at room temperature for the best texture and flavor.