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Chocolate Hazelnut Crunch Cake

Chocolate Hazelnut Crunch Cake

A soft, Kahlua-infused cake will leave you devouring a slice longing for more. The cake is flavored with rich hazelnut, a gianduja crunch and dark chocolate.
By Thalia Ho

Chocolate Hazelnut Crunch Cake

Today, I’m sharing the recipe for this Chocolate Hazelnut Crunch Cake. It’s been on the blog back-burner for a few months now…And finally I have gotten around to sharing it! It feels like the appropriate time for a decadent and indulgent cake..

Now, I have baked up many cakes in my culinary journey thus far and I, along with several others that helped take pleasure in devouring this wicked cake, believe that it’s easily one of the best to come out of my kitchen. And it’s all down to gianduja.

Chocolate Hazelnut Crunch Cake

I stumbled across the rare gem online a few months ago. I had heard a lot of good things about it and ordered several packets to try. And my love for all things chocolate has not remained the same since. It’s heavenly chocolate. Basically Nutella in a smooth, intense and solidified chocolate block form. Wicked and addictive stuff – which I’m glad I can only purchase in-frequently online.

Chocolate Hazelnut Crunch Cake

Since my recent discovery, I’ve been dreaming in all things gianduja. Thinking of all the ways I can utilize its deliciously rich and chocolat-y hazelnut goodness. Brimming with ideas, I opted to bake it up and transform it into cake form. And boy what a revolution.

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This cake will leave you devouring a slice all too quickly and longing for just a little bit more. The cake is comprised of three moist Kahlua-infused layers that are deeply flavoured by the rich taste of hazelnut and deep darkness of chocolate.

Chocolate Hazelnut Crunch Cake

The layers are stacked, frosted and filled with a smooth and intense gianduja chocolate frosting. Oh, and there’s also a generous amount of a “Gianduja and hazelnut crunch” added to the filling and top of the cake, which yields the most delicious textural crunch and indulgent mouthful.

After cutting off and devouring a thick slice, I declared this to be one of the best things I had ever eaten.

Chocolate Hazelnut Crunch Cake
A soft, Kahlua-infused cake will leave you devouring a slice longing for more. The cake is flavored with rich hazelnut, a gianduja crunch and dark chocolate.
Recipe Type: Dessert, Baking, Cake
For the Chocolate Hazelnut Cake:
  • ¾ cup hazelnut meal
  • 1 ¾ cups granulated caster sugar
  • 2 ¼ cups all-purpose plain flour
  • ¾ cup dutch processed cocoa powder
  • 1 ½ tsp. baking powder
  • 1 ½ tsp. baking soda
  • 1 tsp. sea salt
  • 2 large eggs, at room temperature
  • 1 cup whole milk, at room temperature
  • ½ cup butter, melted
  • ¼ cup kahlua
  • 1 ½ tsp. vanilla extract
  • ¾ cup boiling water
For the Gianduja Hazelnut Crunch:
  • ½ cup hazelnuts, toasted and coarsely chopped
  • 2 oz. Gianduja chocolate or milk chocolate
  • 2 tbsp. unsalted butter
  • ½ cup Nutella
  • 2 ½ cups rice puffs
For the Gianduja Chocolate Frosting:
  • 10 oz. Gianduja chocolate or other high-quality milk chocolate (such as Lindt or Godiva), finely chopped
  • 6 oz. bittersweet dark chocolate, less than 61%, finely chopped
  • 1 ½ tbsp. light corn syrup
  • 1 ½ cups heavy cream
  • 1 cup (2 sticks, 8 oz. or 226 g) chilled unsalted butter, cut into cubes
For the chocolate hazelnut cake:
  1. Pre-heat the oven to 350 F / 180 C.
  2. Grease and line three 7-inch / 18-centimeter round cake pans and set aside.
  3. Add the hazelnut meal, sugar, flour, cocoa, baking powder, soda and salt to a large mixing bowl. Whisk together until the dry ingredients are evenly combined.
  4. In a separate large mixing bowl, whisk together the eggs, milk, melted butter, kahlua and vanilla extract.
  5. Add the wet ingredients to the dry ingredients and stir with a wooden spoon to just combine then pour in the boiling water. Mix well until combined.
  6. Divide the cake batter evenly between the prepared cake pans and bake until a skewer inserted into the center comes out clean, roughly 30 to 35 minutes.
  7. Let the cakes cool in their pans for 10 minutes before inverting them onto a wire rack to cool completely.
  8. The cakes can be made one day in advance. Keep tightly wrapped at room temperature.
For the Gianduja Hazelnut Crunch:
  1. Line a baking sheet with parchment paper and set aside.
  2. Add the Gianduja and butter to a medium heatproof bowl. Set the bowl over a saucepan of barely simmering water, making sure that the water does not touch the base of the bowl. Heat the mixture, stirring often, until it is melted and smooth then remove from the heat.
  3. Stir in the Nutella and chopped hazelnuts followed by the rice puffs.
  4. Spread the mixture out onto the prepared baking sheet and freeze until set, about 30 minutes.
  5. Once set, use your hands to break the crunch into small pieces.
  6. The crunch can be made one day in advance and kept covered in the fridge or freezer.
For the Gianduja Chocolate Frosting:
  1. Combine both the chocolates and corn syrup in a medium bowl. Bring the cream to a light boil in a small saucepan then pour it over the chocolate bowl. Let it sit to slightly melt for 2 minutes before stirring until smooth.
  2. Once the mixture is smooth transfer it to the bowl of a stand mixer fitted with the beater attachment, or with hand-held electric beaters, beat until cool, 6 to 8 minutes.
  3. Add the butter a few pieces at a time, beating well to incorporate between additions. Continue to beat until the mixture is thick, smooth and very light in colour, about 8 to 10 minutes with a stand mixer, and up to 15 minutes with a hand-held mixer. If the frosting seems too thin, stop occasionally and chill to firm the butter solids before continuing to beat.
For Assembly:
  1. Level out the cooled cake layers. Fix the first layer on a large stand or platter and spread about 1 cup of the frosting over it then sprinkle with ½ scant cup of the Hazelnut Gianduja crunch. Place the second cake layer on top; press gently to adhere and repeat the process with another 1 cup of the frosting and ½ scant cup of the crunch. Top with the third cake layer.
  2. Spread a thin layer of the frosting over the top and sides of the cake to crumb coat and chill the cake for about 30 minutes or until set. The frosting bowl can also be kept in the refrigerator whilst you wait for the crumb coat to harden.
  3. Spread the remaining frosting over the top and sides of the cake then decorate the top of the cake with more of the Hazelnut Gianduja crunch. Chill the cake until completely set, 2 to 3 hours before serving.
  4. You can keep the cake chilled and covered for up to three days. Let it stand at room temperature for 30 minutes before serving.
Cake adapted from a recipe by Molly Yeh
Crunch and frosting adapted from a recipe by bon appetit!

View Comments (2)
  • GORGEOUS….FRANKLY…ALL that need to be said….That being….half of my personal ‘tribe’ does NOT like …for whatever unfathomable reason…the taste of coffee in their chocolate desserts….could I POSSIBLY sub Frangelico (or a Hazelnut liquor) for the Kahlua?…This would be the perfect showstopper torte/cake for the annual Noël family ‘hunkering down’ IF I can alter the café element!!! Beautiful, beautiful cake!

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