Preheat oven to 170C
To make the cookie dough, in a bowl cream softened butter with both sugars till combined. Then drizzle in vanilla extract.
Next, stir in plain flour and baking soda until it turns into a crumbly mixture.
Mix in chocolate chips until well distributed. Set aside.
To make the brownie batter, in a large bowl, whisk in melted butter, both sugars and vanila extract until well combined.
Then add in melted chocolate and cocoa powder.
Mix until the cocoa powder is well dissolved into the mixture.
Then, crack in the eggs and whisk until just combined.
Next, fold in plain flour.
Using a 7-inch square pan greased and lined with parachment paper, scatter 1/3 of the cookie dough mixture into the it.
Then transfer all of the brownie batter into the pan.
Scatter the rest of the cookie dough mixture ontop.
Bake it in the oven for 25 to 35 mintues
Let it cool completely before serving.
Once cooled, cut the browinie into sqaures.