Add the sugar into the melted mixture and beat until smooth and the sugar is combined.
Add the eggs and Vanilla Extract into the 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 the brownie the lovely papery top.
Sieve the flour and Cocoa Powder onto the top of the mixture and fold through until just combined. Finally add the Chocolate Chips and stir through the mixture.
Pour the mixture into the prepared tin and smooth the top. Place in the oven and bake for 25-30 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 the brownie can be sliced up and served!