This chocolate biscuit cake combines crunchy cookies, hazelnuts, and a glossy chocolate top. Sweet, simple, and no-bake, it’s a treat I love to keep ready in the fridge.
Line a rectangular baking pan with parchment paper and set aside.
Toast the hazelnuts in a dry pan over medium heat until fragrant, then let them cool.
Crush half of the cookies in a food processor into small pieces and place them in a large bowl.
Break the remaining cookies into medium pieces and add them to the bowl.
Crush the cooled hazelnuts into crumbs and add them to the cookies, mixing until combined.
In a saucepan over medium heat, melt the condensed milk and butter, stirring until smooth. Remove from heat.
Chop 150 g of dark chocolate into small pieces and add to the warm mixture of butter and condensed milk, and stir until melted.
Whisk in the cocoa powder until smooth.
Pour the chocolate mixture over the cookie and hazelnut mixture and stir until evenly coated.
Transfer the mixture into the prepared pan, pressing it down firmly to create an even layer.
Refrigerate for 4–6 hours, or overnight, until fully set.
Once set, cut the cake into slices.
Cut 100 g of dark chocolate into small pieces and place in a heatproof bowl with the oil. Melt in the microwave.
Dip each cake piece halfway into the melted chocolate, and place on a plate.
Garnish with chopped pistachios. Return the slices to the fridge to allow the glaze to set before serving.
Notes
Crush Cookies with Texture: I like to leave some slightly bigger cookie chunks for extra crunch in every bite.Work Fast with the Mixture: Once the chocolate is added, I stir quickly so the cookies and nuts get coated before it thickens.Chill Overnight if You Can: I’ve found the cake slices much cleaner and firmer when I let it rest overnight.Top with Freshly Chopped Nuts: I always sprinkle the pistachios right after glazing so they stick beautifully.