In a mixing bowl, combine the finely crushed Lotus Biscoff biscuits with the melted unsalted butter. Mix well until the mixture has an even consistency and resembles wet sand, ensuring the cookies are thoroughly coated with the butter.
Transfer the biscuit mixture to a lined 8-inch (20cm) square baking pan. Press the mixture firmly and evenly into the bottom of the pan, using the back of a spatula or your fingers to compact it tightly and create a solid base.
In another bowl, blend the Biscoff spread with the softened cream cheese using a hand mixer or whisk. Mix until the combination is smooth, creamy, and well incorporated, creating a luscious filling.
Spread the Biscoff and cream cheese mixture evenly over the prepared biscuit base. Use a spatula to smooth the surface, ensuring an even layer.
In a microwave-safe bowl, melt the dark chocolate by heating it in 30-second intervals. Stir in between each interval until the chocolate is fully melted and silky smooth.
Pour the melted chocolate over the Biscoff layer, using a spatula to spread it evenly across the surface. This will create a rich chocolate topping.
For added flair, sprinkle a few sea salt flakes on top of the chocolate layer. The salt will enhance the flavors and add a delightful contrast to the sweetness of the bars.
Cover the pan with plastic wrap and place it in the refrigerator to chill for at least 2 hours, or until the mixture is firm to the touch.
Once the bars are set, carefully lift them out of the pan using the lining paper. Utilize a sharp knife to cut them into squares or rectangles, creating neat servings.
Notes
For an elegant presentation, drizzle additional melted Biscoff spread on top.