Prep the Base: Start by melting the butter in a pan. Take your biscuits and blend them into crumbs using a food processor. Combine the melted butter and biscuit crumbs in a bowl, mixing them together until they are well combined.
Create the Crust: Line the bottom of a springform pan with baking paper. Press the biscuit mixture firmly into the bottom of the pan, ensuring it is evenly spread out. Place the pan in the refrigerator and let it chill for 1 to 1.5 hours, allowing the base to firm up.
Melt the Chocolate: While the crust is chilling, place the dark pastry chocolate in a bain-marie or heatproof bowl over simmering water, stirring until smooth.
Whip the Cream: In another bowl, whisk the whipping cream, fresh cheese, and caster sugar until you achieve a light and fluffy texture.
Combine Ingredients: Once your melted chocolate has cooled slightly, gently fold it into the cheese mixture until fully combined.
Assemble: Remove the chilled crust from the refrigerator. Pour the chocolate filling over the biscuit base, smoothing it out with a spatula. Refrigerate the cheesecake for at least 4 hours before serving to allow the flavors to meld beautifully.