Method

1. Preheat the oven to 150°C. Line a 23cm x 7.5cm loaf tin with baking paper.
2. Press cookie dough into the base of the prepared tin, trying to make it as flat as possible. Pipe Biscoff spread over the top, then place in the fridge to firm up.
3. To make the brownie, place eggs and sugars in the bowl of an electric stand mixer (or you can use a hand mixer). Using the whisk attachment, whisk until pale. Add the flour and cocoa and fold to combine, then mix in the melted butter. Gently fold in the chopped chocolates and sea salt, then pour the brownie batter over the chilled cookie dough and Biscoff base.
4. Bake for 60 minutes until the brownie is firm and does not wobble. Cool in the tin completely before removing and slicing to serve.