Decadent Triple-Layer Chocolate Hazelnut Birthday Cake with Salted Caramel Buttercream

Instructions

1. 1

   Prep like a pro: Preheat oven to 175°C/350°F. Grease and line three 8-inch (20 cm) round cake pans (or bake in two pans, split layers after cooling). Bring eggs and dairy to room temperature — they emulsify better.

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   Toast and grind hazelnuts: Spread hazelnuts on a tray, toast 8–10 minutes until fragrant. Rub skins in a towel. Pulse to a fine meal (not paste) and set aside.

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   Dry mix: Sift together flour, cocoa, baking powder, baking soda, and salt into a large bowl. Whisk in granulated and brown sugar until evenly distributed.

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   Wet mix: In a separate bowl, whisk eggs, milk, oil and vanilla until combined. Pour hot coffee over the wet mix (coffee enhances chocolate flavour — don’t skip it).

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   Combine: With a spatula, fold wet into dry until just combined. Fold in ground hazelnuts. Batter will be loose — that’s correct.

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   Bake: Divide batter evenly between pans. Smooth tops. Bake 25–30 minutes, until a toothpick comes out with a few moist crumbs and the cakes spring back lightly. Don’t overbake — we want a tender crumb.

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   Cool: Let cakes rest 10 minutes in pans, then invert onto racks to cool completely. For clean layers, wrap and chill for at least 1 hour (or overnight) — chilled cake trims and stacks beautifully.

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   Make salted caramel: In a heavy saucepan over medium heat, melt sugar without stirring (swirl pan occasionally) until amber. Add butter carefully (it will foam), whisk to combine. Remove from heat and slowly whisk in warmed cream until smooth. Stir in salt, taste. Cool to room temperature — thicker as it cools.

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   Caramel buttercream: Beat butter until pale and fluffy (3–5 minutes). Add sifted powdered sugar in batches on low, then increase speed. Add 6 tbsp caramel, vanilla, pinch salt, and enough cream to reach piping/ spreading consistency. Taste — if you want stronger caramel, add more (but keep texture balanced).

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    Ganache: Heat cream until just simmering. Pour over chopped chocolate in a bowl, let sit 2 minutes, then whisk to a glossy emulsion. Stir in corn syrup for extra shine. Cool until slightly thickened for drip consistency.

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    Assemble — level each cake: If domes formed, trim tops to level. Place first layer on cake board or plate; apply an even 3/4 cup (about 180 g) buttercream. Spoon a thin layer (2–3 tbsp) of salted caramel over buttercream, leaving 1/4 inch from edge. Repeat with second layer. Place final layer on top and apply a thin crumb coat of buttercream all over. Chill 20–30 minutes to set.

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    Finish frosting: Apply a final smooth coat of buttercream. Chill briefly if needed. Warm ganache slightly (if thick) and test drip on the side — use a spoon or squeeze bottle to create controlled drips around the top edge, then pour remaining ganache in center and smooth outward.

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    Garnish: Spoon any remaining caramel into a small piping bag and make a few rosettes or dots on top. Scatter chopped toasted hazelnuts, a few chocolate shards, a delicate sprinkle of flaky sea salt and optional gold leaf.

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    Serve and store: Let cake sit 20–30 minutes at room temperature before slicing so buttercream and ganache soften. Store refrigerated up to 3 days; bring to room temperature before serving for best flavor and texture.

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    Professional tips: Use quality chocolate and real vanilla. Don’t rush cooling — chilling helps clean assembly. Taste and adjust salt in caramel — that balance is what makes this cake thrilling.