In a mixing bowl, stir together the ground cookies and melted butter until the texture resembles wet sand. Press the mixture firmly and evenly into the bottom of a 28 cm/11-inch springform pan using the back of a spoon. Chill in the refrigerator while you prepare the filling.
In a large bowl, combine the white cheese, cream cheese, both sour creams, sugar, and vanilla. Mix using a hand mixer or a stand mixer fitted with the paddle attachment until smooth and creamy. Add the eggs one at a time, mixing well after each addition, until fully incorporated.
Preheat the oven to 300°F (150°C).
Pour the cheesecake batter over the chilled crust and smooth the top with a spatula. Place the springform pan on a baking sheet and bake for about 70 minutes, or until the edges are set and the center is slightly jiggly when gently shaken.
Remove from the oven and let the cheesecake cool completely at room temperature. Once cooled, cover and refrigerate for at least 6 hours or overnight until fully set.
Place the heavy cream, mascarpone, sugar, and vanilla in the bowl of a stand mixer fitted with the whisk attachment, or use a hand mixer. Beat on medium speed until stiff, smooth peaks form.
Spread the whipped cream evenly over the chilled cheesecake using an offset spatula or the back of a spoon. Refrigerate while preparing the topping.
Warm the Lotus Biscoff spread in a microwave-safe bowl in short bursts until melted and pourable. Pour the melted spread over the whipped layer, gently tilting the pan to coat the surface evenly.
Chill the cheesecake until ready to serve. To release, run a thin knife around the edges and unclasp the springform ring. Slice with a hot knife for clean edges and serve chilled.