In a bowl, add flour, salt and set aside.
Now put a heat safe bowl on a pot of simmering water and add your butter, chocolate, oil, cocoa, coffee powder and brown sugar. Mix it on very low heat until all the chocolate and butter is melted and the batter is well combined. If you dont have heat proof bowl, you can do it in microwave giving 20 sec bursts and stirring in between until combined.
Now, in another bowl add eggs, vanilla and sugar and beat with an electric mixer for about 4 minutes or until the mixture is pale and fluffy in color. By this time the chocolate mixture wont be hot anymore. Add it in the eggs mixture and gently fold with a spatula. Add flour mixture and gently fold again until just combined. Add chocolate chunks and fold.
Transfer to a 8*8" pan and bake at 173C for about 24-28mins. Check after 22 minutes , the skewer should come out with few crumbs attached. If not then let it bake a little more.
After the brownie is baked, let it rest in the pan for one hour, then take it out of the pan, and let it completely set before cutting, this might take 2-3 hours or more and then cut it for the clean cuts. Enjoy!!
