Line a 7 inch pan with parchment paper in a way that the parchment comes up the sides too. Pre-heat the oven to 170 degree C.
In a bowl, mix together the flour, cocoa, and baking powder together and set aside.
In a large bowl, add the 2 eggs and sugar and beat for atleast 3-5 minutes. Do not skip this step as this is what will give you a crackly shiny top on the brownies.
Add the vanilla, melted butter, and oil and beat again for a minute.
Finally add the flour mix and mix well. Fold in the chopped chocolate reserving a few to add to the top.
Pour the batter into the pan and top with remaining chocolate.
Bake at 170 degree C for 25-30 minutes or till the brownie pulls away from the sides of the pan.
Let it cool completely before slicing.