Dark Chocolate and Brown Butter Halloween Cake

Ingredients

• 250 g All‑purpose flour (sifted)
• 60 g Cocoa powder (unsweetened)
• 1 tsp Baking soda
• 2 tsp Baking powder
• 2 tsp Espresso powder (or 1 tbsp strong brewed coffee)
• 0.5 tsp Salt
• 4 Large eggs (room temperature)
• 120 ml Neutral oil (e.g., canola or grapeseed)
• 150 g Sour cream
• 180 ml Buttermilk
• 2 tsp Vanilla extract
• 60 ml Strong brewed coffee (cooled) (enhances chocolate flavor)
• 250 g Milk chocolate (for crunch layer)
• 80 g Nutella (hazelnut spread)
• 20 g Additional cocoa powder (for crunch)
• 1 pinch Sea salt (enhances cocoa notes)
• 250 g Unsalted butter (for brown butter and caramel)
• 500 ml Heavy cream (divided among ganache, caramel, mousse, glaze)
• 120 g Glucose syrup (helps smooth texture in ganache and caramel)
• 6 g Gelatin sheets (soaked in cold water)
• 300 g Dark chocolate (66% cacao) (for ganache, caramel, mousse, glaze)
• 150 g Brown sugar
• 1 tsp Sea salt (for caramel)
• 200 g 66% dark chocolate (for mousse)
• 1 tsp Black food coloring paste (gel‑based for mirror glaze)
• 150 g Sugar (for glaze)
• 80 ml Water (for glaze)
• 2 Acetate sheets (for shaping chocolate bats)
• 1 Chocolate bat cookie cutter
• 1 bottle Chocolate cooling spray (or vegetable oil spray) (for setting bat wings)

Instructions

1. Prepare the chocolate cake batter

   In a large bowl whisk together flour, cocoa powder, baking soda, baking powder, espresso powder and salt. In a separate bowl whisk eggs, oil, sour cream, buttermilk and vanilla until smooth, then stir in the cooled coffee. Combine wet and dry ingredients until just incorporated.

   Time: PT30M

2. Bake the cake layers

   Divide the batter evenly between two 20 cm pastry rings lined with parchment. Bake in a pre‑heated 175 °C fan‑assisted oven for 13‑17 minutes, or until a toothpick comes out clean.

   Time: PT20M

   Temperature: 175°C

3. Cool and trim the cakes

   Allow cakes to cool completely on a rack. Trim the tops so each cake is exactly 1.5 cm tall. Set one cake aside (will be top layer) and keep the other in a freezer while you prepare the next components.

   Time: PT30M

4. Make the cocoa‑Nutella crunch layer

   Melt 250 g milk chocolate in a bain‑marie. Remove from heat and stir in Nutella, 20 g cocoa powder, a pinch of sea salt and the prepared fillin (if using). Mix until glossy.

   Time: PT15M

5. Set the crunch layer

   Spread half of the crunch mixture over the first cake layer, level with a palette knife and return the cake to the freezer to set.

   Time: PT20M

6. Prepare brown butter

   Melt 250 g unsalted butter in a saucepan over medium heat. Continue cooking, swirling occasionally, until the butter turns a deep amber color and smells nutty. Remove from heat and let cool to a spreadable consistency.

   Time: PT10M

7. Make brown‑butter chocolate ganache

   Chop 250 g dark chocolate and place in a heat‑proof jug. Heat 200 ml heavy cream with 60 g glucose syrup to just below boiling (≈95 °C), then add soaked gelatin sheets (6 g). Pour the hot cream over the chocolate, let sit 1 minute, then blend with an immersion blender until smooth. Add the cooled brown butter and blend again. Chill in the fridge until set.

   Time: PT25M

8. Prepare brown‑butter caramel

   Re‑use the brown butter from step 6. In a saucepan combine 150 g brown sugar, 200 ml heavy cream, 60 g glucose syrup, 1 tsp sea salt and the remaining brown butter. Heat to 109 °C while stirring. Remove from heat, pour into a jug, add 200 g dark chocolate and blend until smooth. Transfer to a plastic box to cool, then fill a piping bag.

   Time: PT20M

   Temperature: 109°C

9. Assemble ganache and caramel layers

   Whisk half of the set ganache (from step 7) with a hand mixer, pipe a 1.5 cm thick layer over the frozen crunch layer, and return to freezer for 20 minutes. Then pipe a 1.5 cm layer of caramel (step 8) over the ganache, level, and place the second chocolate cake on top. Freeze for 10 minutes before adding the remaining crunch layer.

   Time: PT30M

10. Finish ganache layers

    Whip the remaining ganache until light, pipe another 1.5 cm layer over the second crunch layer, freeze 20 minutes, then pipe the final caramel layer, level, and freeze the entire cake overnight (minimum 8 hours).

    Time: PT45M

11. Make dark chocolate mousse

    Melt 200 g dark chocolate and set aside. Heat 200 ml heavy cream to just below boiling, whisk in soaked gelatin (6 g), then pour over the chocolate while stirring. Cool to room temperature, then fold in lightly whipped cream (200 ml) until fully incorporated. Spoon the mousse into a silicone mold, then place the frozen cake (caramel side down) onto the mousse and freeze fully overnight.

    Time: PT30M

12. Prepare black mirror glaze

    Place 250 g milk chocolate in a jug. Soak gelatin sheets (6 g) in cold water. In a saucepan heat 150 g sugar, 80 ml water, 150 ml heavy cream and 60 g glucose syrup to a boil, then whisk in the soaked gelatin. Pour the hot syrup over the chocolate, blend with immersion blender, add black food‑coloring paste and blend until fully black. Cool the glaze to 34‑35 °C.

    Time: PT25M

13. Glaze the cake

    Place the fully frozen cake on a cooling rack. Pour the 34‑35 °C glaze over the cake, allowing it to flow over the sides. Use two palette knives to smooth excess glaze and achieve a glossy finish.

    Time: PT15M

    Temperature: 34-35°C

14. Create chocolate bat decorations

    Melt black‑colored chocolate and spread between two acetate sheets, level with a bowling pin, then chill until firm. Cut bat shapes with a cookie cutter, split each bat in half with a hot knife, and re‑assemble using a spray of chocolate cooling spray to create raised wings. Attach bats to the cake with a dab of melted chocolate and a final spray.

    Time: PT45M

15. Final presentation

    Transfer the glazed cake to a serving plate, arrange chocolate ribbons and bats, and let the cake sit at room temperature for 10 minutes before slicing.

    Time: PT10M

Nutrition Facts

Calories

480

Protein

5 g

Carbohydrates

38 g

Fat

33 g

Fiber

4 g

Ingredient Substitutions

• Instead of All‑purpose flour: cake flour
• Instead of Cocoa powder: Dutch‑process cocoa
• Instead of Espresso powder: instant coffee
• Instead of Large eggs: egg replacer (for veg)
• Instead of Neutral oil (e.g., canola or grapeseed): vegetable oil
• Instead of Sour cream: Greek yogurt
• Instead of Buttermilk: milk + lemon juice
• Instead of Milk chocolate: dark chocolate (70%)
• Instead of Nutella (hazelnut spread): chocolate hazelnut spread
• Instead of Heavy cream: double cream
• Instead of Glucose syrup: corn syrup
• Instead of Gelatin sheets: powdered gelatin
• Instead of Dark chocolate (66% cacao): 70% dark chocolate
• Instead of Black food coloring paste: black gel food coloring

Equipment Needed

• Stand mixer or hand whisk
• Two 20‑cm (8‑inch) pastry rings
• Fan‑assisted oven
• Freezer
• Saucepan
• Heat‑proof jug or bowl
• Immersion hand blender
• Piping bags and tip (large round)
• Silicone mold (for mousse)
• Baking cooling rack
• Palette knives (2)
• Thermometer (digital)
• Bowling pin (or small rolling pin) (optional)
• Plastic box (for caramel cooling) (optional)

Critical Steps — Do Not Skip

• Layer setting (freezer/chill times)
• Brown butter color
• Caramel temperature
• Gelatin dissolution
• Mirror glaze temperature

Chef Tips from the Video

• Use a kitchen scale for all ingredients – chocolate cakes are unforgiving to measurement errors.
• For an extra glossy glaze, strain the glaze through a fine mesh before pouring.
• A quick dip of the finished cake in a thin layer of melted dark chocolate adds a deep black edge.

Troubleshooting

Storage

Refrigerator: Store covered for up to 4 days. Mirror glaze may dull; re‑glaze if needed.

Freezer: Can be frozen wrapped tightly for up to 1 month. Thaw in refrigerator 12‑24 h before serving.

Room temperature: Do not leave at room temperature longer than 2 hours due to ganache and caramel.

Make-Ahead Tips

• Prepare the cake base, crunch layer, ganache, caramel, and mousse up to 24 hours ahead and keep each component covered in the fridge.
• Mirror glaze can be made a day ahead; re‑heat gently to 34‑35 °C before use.
• Bats and ribbons can be molded and stored in an airtight container at room temperature.