Preheat oven to 180℃.
In a bowl mix the rapeseed oil, sugar, vanilla extract, flax eggs and milk.
Melt the chocolate and fold into the mix until all ingredients are fully incorporated (this should look like thick melted chocolate).
Fold in the oat flour, baking powder and cocoa powder and mix until a smooth batter is achieved.
Coarsely crush 5 cookies and fold into the batter.
Place into a square tin (ideally spongiform) lined with greaseproof paper and bake for 20 minutes.
Remove from the oven (a toothpick should come out with a little batter that isn’t too runny).
Allow to cool to room temperature or below and leave in tin.
Spread 3 tbsp biscoff spread on top and leave aside.
In a food processor, add the cashews, coconut milk, vanilla extract and coconut cream. Blitz into a smooth cream.
Pour on top of the brownie and leave in the fridge for at least 3 hours to allow cashew cream to set (or in the freezer for 2 hours).
Remove from tin carefully and transfer to tray or large flat plate.
Drizzle with the remaining biscoff sauce (you can heat it to get a more runny texture, but not too much), cookies and some melted chocolate.
Cut into chunks before serving.