First things first, preheat the oven to 180°C/ 160°C Fan/Gas Mark 4. Grease and line a 10”x 8” rectangle baking tin. Next up break the Chocolate into pieces and place in a microwavable bowl and pop in the butter. Melt together in the microwave in 30 second bursts, stirring between each burst until the mixture is melted.
Pop the sugar into the melted mixture and beat until smooth and the sugar is combined.
Add the eggs and Vanilla Extract into the chocolatey mixture and whisk on a high speed for 2-3 minutes, this is easiest to do with a freestanding or hand whisk. It is whisking in the eggs really well that gives you that lovely papery brownie top.
Sieve the flour, Cocoa Powder and espresso powder onto the top of the mixture and fold through until just combined. Crush most of the biscoff biscuits into pieces, keeping a few aside to pop on top of the brownie later. Pop your crushed biscuits into brownie mixture and stir through.
Pour the mixture into your prepared tin and smooth the top. Dollop the biscoff spread over the top of your brownie and swirl through using a cocktail stick, pop the leftover biscuits into the top of the brownie and bake in the oven for 30 minutes, until the edges of the brownie are firm and the middle has a very slight wobble. Leave the brownie to cool in the tin.
Once cooled your delicious biscoff brownie is ready to slice up and serve!