This chocolate sheet cake is quick, fudgy, and perfect for feeding a crowd. It uses simple pantry ingredients and a simple cocoa frosting. It cools and frosts easily, so it’s a great weeknight treat or a go-to for potlucks and birthdays. If you enjoy easy sheet cakes, you might also like this easy chocolate sheet cake with creamy frosting for another simple take.

What makes this cake worth baking

This recipe is fast, forgiving, and gives a tender, moist cake every time. The hot water (or coffee) blooms the cocoa, which deepens the chocolate flavor without extra steps. It’s flexible — use milk or buttermilk, oil or melted butter — and the frosting is smooth and quick to spread. That makes it great when you want a big dessert without fuss.

How to make Chocolate Sheet Cake — step by step

Ingredients:

• 2 cups (250g) flour
• 2 cups (400g) granulated sugar
• 1 cup (120g) cocoa powder
• 1 cup (240ml) hot water or brewed coffee
• 1 cup (240ml) milk or buttermilk
• 1 cup (240ml) vegetable oil or 225g melted butter
• 3 large eggs (at room temperature)
• 2 teaspoons baking powder
• 1 1⁄2 teaspoons baking soda
• 1⁄2 teaspoon salt
• 2 teaspoons vanilla extract

For the frosting:

• 1⁄2 cup (115g) butter (softened)
• 1⁄4 cup (30g) cocoa powder
• 2 cups (250g) powdered sugar
• 3–4 tablespoons milk
• 1 teaspoon vanilla extract

Directions:

1. Preheat the oven to 175°C (350°F). Grease a 9×13-inch (approx. 23×33 cm) baking pan and line it with parchment paper.
2. In a large bowl, mix together the flour, sugar, cocoa, baking powder, baking soda, and salt.
3. Add the eggs, milk, oil, and vanilla, and beat until smooth.
4. Finally, add the hot water or coffee – the batter will be runny, which is normal.
5. Pour the batter into the pan and bake for 30–35 minutes. It’s done when a toothpick comes out clean.
6. Let the cake cool completely. For the frosting:
   1. Beat the butter and cocoa until creamy.
   2. Slowly add the powdered sugar, milk, and vanilla.
   3. Once smooth and spreadable, spread over the cooled cake.

(If you like sheet cakes with a different flavor, try a fruit twist like an apple cinnamon version here: apple cinnamon sheet cake.)

Easy ways to serve your Chocolate Sheet Cake

Serve slices plain or warm a piece briefly and add a scoop of vanilla ice cream. For parties, cut the cake into squares and arrange on a platter. You can also pipe a few dollops of whipped cream on top or sprinkle chopped nuts for texture.

Best methods to store leftover cake

• At room temperature: Keep covered tightly with plastic wrap for 2 days.
• In the fridge: Store in an airtight container for up to 5 days. Bring to room temperature before serving for best flavor.
• In the freezer: Wrap individual slices or the whole cake in plastic and foil. Freeze up to 2 months. Thaw in the fridge overnight, then warm slightly if desired.

Smart tips to make Chocolate Sheet Cake better

• Use hot brewed coffee in place of water for a richer chocolate taste.
• Measure flour by spooning it into the cup and leveling — too much flour makes the cake dry.
• Let the cake cool completely before frosting to avoid a runny topping.
• If your frosting is too thick, add milk a teaspoon at a time until spreadable.
• For a smoother frosting, sift the cocoa and powdered sugar before mixing.
  For a rich layered dessert idea, check this brownie-cheesecake combo: brownie cheesecake recipe.

Simple variations you can try

• Salted caramel ganache: Replace the frosting with a whipped salted caramel ganache for a glossy, flavor-packed finish.
• Chocolate chips or nuts: Fold 1 cup chocolate chips or chopped nuts into the batter.
• Espresso kick: Add a teaspoon of instant espresso powder to the batter for deeper flavor.
• Sheet-cake cupcakes: Bake in a muffin tin for shorter time and single-serve treats.

Estimated nutrition per serving (approximate)

Per slice (1 of 12):

• Calories: 420 kcal
• Fat: 22 g (sat. fat: 10 g)
• Carbohydrates: 55 g
• Sugar: 36 g
• Protein: 5 g
• Sodium: 320 mg

Values are estimates and will vary with ingredients and serving size.

Family-friendly serving ideas

• Cut into small squares for kids’ lunchboxes or school events.
• Top with fruit (strawberries or raspberries) and a drizzle of chocolate for a brighter presentation.
• Make a sheet-cake trifle by layering cake cubes with whipped cream and fruit.
  Try pairing this cake with an easy dump-style brownie dessert for gatherings: brownie dump cake with chocolate chips.

What to serve with this cake

• Drinks: Milk, coffee, or a simple cold brew complement the chocolate.
• Sides: Vanilla ice cream, whipped cream, or fresh berries cut through the richness.
• For a party: Serve with small plates of mixed nuts and salty snacks to balance sweetness.

Frequently asked questions

Q: Can I use regular water instead of coffee?
A: Yes. Hot water works fine. Coffee adds depth but is optional.

Q: Can I reduce the sugar?
A: You can lower sugar slightly, but the texture and taste will change. Try reducing by 1/4 cup and taste the batter.

Q: How do I know when the cake is done?
A: Insert a toothpick in the center. If it comes out clean or with a few moist crumbs, it’s done. Avoid overbaking.

Q: Can I make this gluten-free?
A: Use a 1:1 gluten-free flour blend designed for baking. Texture may vary, so test doneness early.

Q: Can I double the recipe for a larger pan?
A: Yes. Adjust bake time and use a larger pan or two 9×13 pans. Monitor with a toothpick.

Conclusion

For a classic, crowd-pleasing chocolate sheet cake, this recipe is simple and reliable. For more ideas and different takes on sheet cakes, see this rich take on a Texas favorite: Best Texas Sheet Cake – Chocolate Sheet Cake Recipe, a salted caramel frosting version here: Chocolate Sheet Cake with Whipped Salted Caramel Ganache, and another moist version at Moist Chocolate Sheet Cake – Cakes by MK.

Chocolate Sheet Cake

This quick, fudgy chocolate sheet cake is perfect for feeding a crowd and uses simple pantry ingredients with an easy cocoa frosting.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 35 minutes mins

Total Time 55 minutes mins

Course Dessert, Snack

Cuisine American

Servings 12 slices

Calories 420 kcal

Ingredients

  

Cake Ingredients

• 2 cups flour All-purpose flour
• 2 cups granulated sugar
• 1 cup cocoa powder Unsweetened cocoa powder
• 1 cup hot water or brewed coffee Coffee adds a richer chocolate flavor
• 1 cup milk or buttermilk
• 1 cup vegetable oil or melted butter
• 3 large eggs At room temperature
• 2 teaspoons baking powder
• 1.5 teaspoons baking soda
• 0.5 teaspoon salt
• 2 teaspoons vanilla extract

Frosting Ingredients

• 0.5 cup butter Softened
• 0.25 cup cocoa powder
• 2 cups powdered sugar
• 3-4 tablespoons milk
• 1 teaspoon vanilla extract

Instructions

 

Preparation

• Preheat the oven to 175°C (350°F). Grease a 9x13-inch baking pan and line it with parchment paper.
• In a large bowl, mix together the flour, sugar, cocoa, baking powder, baking soda, and salt.
• Add the eggs, milk, oil, and vanilla, and beat until smooth.
• Finally, add the hot water or coffee – the batter will be runny, which is normal.
• Pour the batter into the pan and bake for 30–35 minutes. It's done when a toothpick comes out clean.

Frosting

• Let the cake cool completely.
• Beat the butter and cocoa until creamy.
• Slowly add the powdered sugar, milk, and vanilla.
• Once smooth and spreadable, spread over the cooled cake.

Notes

For a richer chocolate taste, use hot brewed coffee instead of water. Measure flour correctly to avoid drying out the cake. Allow the cake to cool completely before frosting.

Keyword Chocolate Cake, Easy Dessert, Fudgy Cake, Quick Dessert, Sheet Cake