Cake Decorating Blog

A To-Die-For Hazelnut Cake With Chocolate Hazelnut Ganache & Buttercream (OMG)

This elegant — and deceptively simple — hazelnut cake with chocolate hazelnut ganache and buttercream (OMG) is sure to make jaws drop. Serve it as a birthday cake, for a special anniversary, or just because!

Make this heavenly hazelnut cake with our recipe and decorating tutorial

All images and recipe via Erin Bakes

The hazelnut cake is a no-fuss, no-mixer-needed recipe and the ganache does double duty as a cake filling and as the flavoring for the buttercream. Creating the stunning chocolate buttercream flower topper doesn't require an advanced pastry degree — just the right piping tip and a little bit of patience. 

Chocolate hazelnut layer cake recipe

Ingredients:

For the cake:

Yields three 6" round cake layers.

  • 3 cups cake flour
  • 2 cups coarsely ground toasted hazelnuts (reserve 3 whole hazelnuts for garnish)
  • 1¾ cups granulated sugar
  • 1½ teaspoons baking powder
  • 1 teaspoon kosher salt
  • 4 large eggs
  • 1 cup milk
  • ½ cup vegetable oil
  • 4 tablespoons unsalted butter, melted 
  • 1 tablespoon pure vanilla extract
  • 3 tablespoons Frangelico or hazelnut liquor (or 1 tablespoon hazelnut extract)

For the ganache:

Yields about 1 cup of ganache

  • ½ cup heavy cream
  • ½ cup chocolate hazelnut cream (like Nutella)
  • 8 ounces dark chocolate, chopped
  • 1 tablespoon Frangelico (or 1 teaspoon hazelnut extract)

For the Swiss meringue buttercream:

Yields about 5 cups of buttercream 

  • 1 cup pasteurized egg whites
  • 2 cups granulated sugar
  • 2 pounds room temperature unsalted butter, cubed
  • 2 tablespoons pure vanilla extract
  • ½ cup of the ganache

Supplies:

Baking the cake and the ganache

Step 1:

Position a rack in the center of the oven and preheat the oven to 350 F. Grease and flour three 6" round cake pans. Set aside while you prepare the batter. 

Step 2:

Hazelnut Cake Dry Ingredients | Erin Gardner | Craftsy

Add cake flour, 1 cup of hazelnuts, sugar, baking powder and salt to a large mixing bowl and stir until thoroughly combined. 

Step 3:

In a smaller bowl or measuring cup, whisk together the eggs, milk vegetable oil, melted butter, vanilla and Frangelico. 

Hazelnut Cake Wet & Dry Ingredients | Erin Gardner | Craftsy

Pour the wet mixture over the dry and whisk until just combined. Switch to a spatula to finish mixing if the batter gets too thick for the whisk. 

Hazelnut Cake Batter | Erin Gardner | Craftsy

Filled Cake Pans | Erin Gardner | Craftsy

Divide the batter evenly between the three prepared bans.

Step 4:

Bake for 40-45 minutes or until a toothpick inserted in to the center of the cake comes out clean or with a few crumbs sticking to it.  

Step 5:

Set the cake pans on a rack until they are cool to the touch. Turn the cakes out of the pans and set them on a flat surface to continue cooling. Allow the cakes to cool completely before filling, about 30 minutes. Pop the cakes in the fridge if you want them to cool faster. 

Step 6:

Hazelnut Ganache Ingredients | Erin Gardner | Craftsy

While the cakes are cooling, combine chopped chocolate, chocolate hazelnut cream and Frangelico in a large mixing bowl. 

In a medium sauce pan, bring the heavy cream to a boil. Shut the heat off as soon as you see the first bubbles.

Hazelnut Ganache | Erin Gardner | Craftsy

Pour the hot cream over the chocolate mixture and whisk until all the chocolate chunks have melted. Set the ganache aside at room temperature while you work on the buttercream. 

Step 7:

Fill a small sauce pan one-third of the way up with water. Set the pan over high heat. Turn the heat down to medium-low once the water comes to a boil. 

Combine egg whites and sugar in a medium heatproof bowl. Set the bowl on top of the sauce pan. Whisk the mixture every few minutes until the sugar has completely dissolved, about 5 minutes. Cook the mixture to 160 degrees F if you are using fresh egg whites. (Fresh egg whites will whip up much faster than pasteurized ones.)

Step 8:

Pour the egg white mixture into the bowl of a stand mixture fitted with the whisk attachment. Add the vanilla extract. Turn the mixture to high speed and whip it until the egg whites reach soft peaks. 

Turn the mixer to low and add the butter to the meringue a few cubes at a time. Once all of the butter has been added, turn the mixer back up to high and whip until the buttercream is smooth and fluffy, about 5 minutes. 

Adding Ganache to the Buttercream | Erin Gardner | Craftsy

Turn the mixer back down to low speed and add the ganache. Mix until combined. Stop and scrape down the sides of the bowl with a rubber spatula as needed. 

Chocolate Hazelnut Swiss Meringue Buttercream | Erin Gardner | Craftsy

Assembling the cake

Step 1:

 Leveled Hazelnut Cake | Erin Gardner | Craftsy

Use a serrated knife to level the domed tops of the cakes.  Smear a dab of buttercream or ganache on a 6" round cake board. Press one of the layers of cake onto the smear to adhere it to the cake board.

Adding a Thin Layer of Ganache | Erin Gardner |Craftsy

Use an offset spatula to spread a thin layer of ganache onto the layer of cake. 

Step 2:

Adding the Chocolate Hazelnut Buttercream | Erin Gardner | Craftsy

Smoothed Buttercream Layer | Erin Gardner | Craftsy

Top the ganache with roughly ½ cup of buttercream. Smooth the buttercream layer out with an offset spatula and top it with another layer of cake. 

Adding the Second Layer of Cake | Erin Gardner | Craftsy

Step 3:

Adding Another Layer of Ganache | Erin Gardner | Craftsy Adding Second Layer of Buttercream | Erin Gardner | Craftsy

Repeat with another layer of ganache and buttercream. Top with the final layer of cake, cut side down. 

Finished Filled Cake | Erin Gardner | Craftsy

Step 4:

Crumb Coating the Cake | Erin Gardner | Craftsy Crumb Coated Cake | Erin Gardner | Craftsy

Crumb coat the cake with a thin layer of buttercream. (Check out this tutorial for full step-by-step directions for crumb coating.)

Pop the cake in the fridge to allow the layers to firm up and the crumb coat to set, 20 minutes to overnight. 

Step 5:

Smoothing the Final Coat of Buttercream | Erin Gardner | Craftsy

Finish the sides of the cake with a thicker coat of buttercream. Use a bench scraper or straight icing spatula to smooth the sides.

Smoothing the Top of the Cake | Erin Gardner | Craftsy

Use an offset spatula to spread approximately ¼ cup of ganache onto the layer cake. Don't worry about making the top of the cake perfectly smooth — just clean up the edges. 

Decorating the cake

Step 1:

Adding the Flower's Center | Erin Gardner | Craftsy

Spread a small circle of ganache (about 2 tablespoons) in the center of the top of the cake. Sprinkle a smaller circle of chopped hazelnuts on top of the ganache. Position three hazelnuts to create the center of the large buttercream flower.

Step 2:

Fill a piping bag fitted with a large St. Honore tip with the remaining buttercream.

 St. Honore Piping Tip | Erin Gardner | Craftsy

Hold the bag so that the slit in the tip is facing up. Position the tip so that the bottom edge sits just above the center of the cake. Piping the First Petal | Erin Gardner | CraftsyFinishing the First Petal | Erin Gardner | Craftsy

Apply pressure to the bag and pipe a small arch of buttercream around the hazelnuts. Shortly before you get to the end of your first petal, release pressure and pull the tip down and away from the cake.

Piping the Second Petal | Erin Gardner | Craftsy

Start the next petal above this one about half way down. Repeat, overlapping petals, until the entire top of the cake is filled. 

Finished Buttercream Flower | Erin Gardner | Craftsy

Step 3:

Applying the Hazelnut Border | Erin Gardner | Craftsy

Scoop up some of the remaining chopped hazelnuts and press the nuts into the sides of the cake all the way around the bottom edge to create a border. 

Finished Chocolate Hazelnut Cake | Erin Gardner | Craftsy

Slice in and enjoy immediately or allow the cake to sit at room temperature for up to 4 hours. 

Store the cake in the fridge for up to three days lightly draped with plastic wrap or in a cake saver. Allow the cake to return to room temperature before serving. 

Chocolate Hazelnut Cake Recipe | Erin Gardner | CraftsySlice of Hazelnut Cake with Chocolate Hazelnut Ganache and Buttercream | Erin Gardner | Craftsy

15 Comments

Helen S.

The recipe for the chocolate/hazelnut cake is missing a couple of instructions. For instance, how much ganache is added to the buttercream frosting? How much ganache is needed for the cake layers and how much extra ganache is needed for center top?

Reply
Erin Gardner

Hi Helen! In the buttercream ingredients you’ll notice that 1/2 cup of the ganache is listed there. The ganache recipe yields about 1 cup of ganache (will add that now). You can spread as thick or thin of a layer as you like. Feel free to add it to your taste! 🙂

Reply
Arden Allen

This cake looks delicious, I can’t wait to try it.
Small typo on the amount of vegetable oil, I will assume you meant 1/2 cup.
Thank you so much for such a great recipe.

Reply
Erin Gardner

Yes – 1/2 cup! What a strange typo! Thanks for catching that. 🙂

Reply
Judi

Looks good, but I have a question about the ganache amounts. The article says to put the ganache into the buttercream, then it says to put ganache between the cake layers and on top for part of the flower design.
Here is my question, how much ganache is needed? If the recipe makes one cup, how much do you keep back to frost the layers and how much goes in the buttercream? Thanks, Judi

Reply
Erin Gardner

Hi Judy – you’ll notice in the buttercream ingredients there is 1/2 cup of the ganache listed as an ingredient. You’ll use the rest to fill the cake and a tiny smear on top. Thanks!

Reply
Jo

What is the correct oil amount? Is the amount 2 1/2 cups of oil or only 1/2 cup?

Reply
Christopher Banks

Such an amazing and tasty cake Erin! Where do you come up with your ideas for cakes such as these?

Reply
Erin Gardner

Thanks so much! 🙂 This one was inspired by Nutella – yum!

Reply
Laurie Alexander

This cake was delicious, but I suspect I must have done something wrong, since the texture was closer to a cookie than a cake. Am I correct there is NO liquid in the cake batter? Just butter and oil? Also, there was WAY more (delectable!) frosting than I needed.

Reply
Erin Gardner

Hi Laurie! I’m so excited that you made the cake and I am SO sorry that I omitted the milk in the cake recipe. You are absolutely correct. There should be 1 cup of milk included with the wet ingredients. I’m not sure what happened when I transferred this recipe from my files to the blog post, but I do apologize! As for the excess frosting, did you do the same giant flower on top? The large batch of buttercream is to accommodate filling the layers, crumb coating, final coating, and piping the large bloom. Glad you enjoyed it even though it wasn’t right! And I do apologize again!

Reply
Regina

I made this cake as a 13 x 9. I also made it before the correction where I was to add milk so it was cookie like. Regardless….this is an AMAZING recipe! Everyone just raved about it. The frosting is the best I have ever had. Thanks so much for the recipe. Next time I will add the milk but it was pretty darn good without it as well.

Reply
Regina

On a side note….I love this frosting so much that I have made it since with a couple of changes. I omitted the ganache and instead took a 1/4 c of Kahlua mixed with a heaping Tbsp of espresso powder, stirred until blended. I added a 1/2 c of dulce de leche and blended it well. I added this to the frosting instead and put this over a delicious banana cake. Jaw dropping!

Reply
Erin Gardner

Oooh, great idea! Thanks for sharing! 🙂

Reply

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