Preheat oven to 325F and line an 8x8 baking sheet with parchment paper.
Place the chocolate and butter in a large microwave-safe bowl and use 30 seconds increments to melt the two together.
Mix in the cocoa powder, then mix in the light brown sugar and granulated sugar.
Add the eggs and use the whisk to vigorously mix them in until the mixture is smooth.
Fold in the flour and salt then pour the batter into the prepared pan.
Use a small cookie spoon (or a teas spoon) to scoop the biscoff butter ontop of the batter. Gently press the cookie butter then randomly top it with Lotus cookies.
Bake for 20-22 minutes or just until a toothpick comes out from the center of the pan with moist crumbs.
Remove from the oven and allow to cool before inveritng and slicing.