This Chocolate Cake is rich, deeply chocolatey, and incredibly moist, with soft layers covered in silky Chocolate Swiss Meringue Buttercream. The combination of Dutch-processed cocoa, buttermilk, dark chocolate, and smooth buttercream creates an elegant celebration cake that’s perfect for birthdays, holidays, or any serious chocolate craving.

Recipe Information

• Prep Time: 35 minutes
• Bake Time: 45 minutes
• Cooling & Assembly: 1 hour
• Total Time: About 2 hours 20 minutes
• Servings: 12–14 slices
• Course: Dessert
• Cuisine: American
• Difficulty: Intermediate

Ingredients

Chocolate Cake

• 2 cups all-purpose flour
• 2 cups granulated sugar
• ¾ cup Dutch-processed cocoa powder, sifted
• 2 teaspoons baking soda
• 1 teaspoon baking powder
• 1 teaspoon salt
• ½ cup vegetable oil
• 1 cup buttermilk, room temperature
• 1 cup hot water
• 2 large eggs, room temperature
• 2 teaspoons vanilla extract

Chocolate Swiss Meringue Buttercream

• 5 large egg whites
• 1½ cups granulated sugar
• 1½ cups unsalted butter, softened to room temperature
• 8 oz good-quality dark chocolate, chopped, melted and cooled

For Decorating

• Chocolate curls
• Chocolate sprinkles
• Chocolate pearls or flakes, optional

Equipment Needed

• Two 8-inch round cake pans
• Parchment paper
• Stand mixer
• Paddle and whisk attachments
• Mixing bowls
• Wire cooling rack
• Candy thermometer
• Offset spatula
• Cake turntable, optional
• Piping bag with 1M piping tip

Instructions

Step 1 – Prepare the Cake Pans

Preheat the oven to 350°F (175°C).

Grease two 8-inch round cake pans, dust them lightly with cocoa powder, and line the bottoms with parchment paper.

Step 2 – Combine the Dry Ingredients

Add the flour, sugar, cocoa powder, baking soda, baking powder, and salt to the bowl of a stand mixer.

Mix briefly until evenly combined.

Step 3 – Combine the Wet Ingredients

In a separate bowl, whisk together the vegetable oil, buttermilk, eggs, and vanilla.

Slowly pour in the hot water while whisking continuously.

Step 4 – Make the Batter

Pour the wet ingredients into the dry ingredients.

Mix on medium speed for approximately 2–3 minutes.

The batter will be quite thin—this is normal.

Step 5 – Bake

Divide the batter evenly between the prepared pans.

Bake for approximately 40–45 minutes, or until a cake tester inserted into the center comes out mostly clean with only a few moist crumbs.

Allow the cakes to cool in their pans for 10 minutes before transferring them to wire racks to cool completely.

Chocolate Swiss Meringue Buttercream

Step 6 – Heat the Egg Whites

Combine the egg whites and granulated sugar in a heatproof mixing bowl.

Place the bowl over a saucepan of gently simmering water, making sure the bottom doesn’t touch the water.

Whisk constantly until the sugar has completely dissolved and the mixture reaches 160°F (71°C).

Step 7 – Whip the Meringue

Transfer the bowl to the stand mixer.

Using the whisk attachment, beat on medium-high speed for 5–10 minutes, until stiff glossy peaks form and the bowl feels cool to the touch.

Step 8 – Add the Butter

Switch to the paddle attachment.

Gradually add the softened butter, a little at a time, beating continuously.

Continue mixing until the buttercream becomes smooth and silky.

Step 9 – Add Chocolate

Slowly add the melted and completely cooled dark chocolate.

Beat until the frosting is smooth, fluffy, and evenly chocolate-colored.

Assembly

Step 10 – Fill the Cake

Place the first cake layer on a serving plate or cake board.

Spread approximately 1 cup of chocolate buttercream evenly over the top.

Place the second cake layer on top.

Step 11 – Crumb Coat

Cover the entire cake with a thin layer of buttercream.

Refrigerate for approximately 20 minutes to set the crumb coat.

Step 12 – Final Frosting

Spread additional buttercream over the top and sides of the chilled cake.

Smooth the sides with an offset spatula and create a decorative swirl on top.

For a bakery-style finish, use a piping bag fitted with a 1M tip to pipe decorative rows or swirls around the cake.

Finish with chocolate curls, sprinkles, pearls, or chocolate flakes.

Storage

Keep the finished cake covered at room temperature for 1 day or refrigerate for up to 4 days. For the best texture, bring refrigerated slices to room temperature for about 30 minutes before serving.

Unfrosted cake layers can also be wrapped tightly and frozen for up to 2 months.

Tips for the Best Chocolate Cake

• Don’t worry if the cake batter looks unusually thin; that’s expected.
• Use Dutch-processed cocoa for a darker, smoother chocolate flavor.
• Add the hot water slowly so it doesn’t scramble the eggs.
• Make sure the cakes are completely cool before frosting.
• The melted chocolate must also be cool before adding it to the buttercream.
• If the Swiss meringue buttercream looks curdled while adding butter, continue beating—it often comes back together.
• Use a kitchen scale to divide the batter evenly for matching cake layers.

Nutrition — Approximate Per Slice

Based on 14 servings:

• Calories: 570
• Protein: 6g
• Carbohydrates: 68g
• Fat: 32g
• Sugar: 49g

Frequently Asked Questions

Can I make the cake layers ahead of time?
Yes. Bake and cool them completely, wrap tightly, and refrigerate for 2 days or freeze for up to 2 months.

Why is my Swiss meringue buttercream runny?
The meringue or butter may have been too warm. Chill the bowl briefly, then continue whipping until the frosting thickens.

Can I use milk chocolate instead of dark chocolate?
Yes, although the frosting will be sweeter and have a milder chocolate flavor.

Can I make cupcakes with this batter?
Yes. Fill cupcake liners approximately two-thirds full and start checking them around 18–22 minutes.

Final Thoughts

This Chocolate Cake with Chocolate Swiss Meringue Buttercream delivers everything a chocolate dessert should: moist cake, intense cocoa flavor, silky frosting, and plenty of rich dark chocolate. It’s impressive enough for celebrations while still using straightforward ingredients and techniques.