In two bowls, Melt Butter and Chocolate separately. Let the chocolate cool a little bit.
Combine the two and whisk well.
Add Cocoa Powder and whisk well.
Add Eggs to this and whisk until the mixture is smooth.
Add Sugar and combine till smooth.
Add APF and mix until a thick smooth mixture. If you feel that the mixture is too tight, add some milk or water until it feels smooth like a thick Lava.
Line a 10″ square pan with parchment paper. Preheat oven at 180°C
Crush chocolate biscuits to a sand-like powder. Spread it equally to the base on the pan. Press down.
Evenly spread the brownie batter on top.
Whisk softened cream cheese with 1 tbsp of APF.
Dollop that on top of the brownie batter along with dollops os Nutella.
Using a skewer or fork, swirl it around.
Add broken pieces of toasted walnuts and biscuits on top.