Preheat the oven to 350 degrees F and line a 9x9 inch pan with parchment paper.
In a small bowl, add the bittersweet chocolate and olive oil.
Place over a small saucepan of simmering water, and stir often until fully melted.
Remove the chocolate oil mixture from the double boiler and allow to cool for a few minutes.
Meanwhile, in a large bowl, add the sugars, eggs, and vanilla.
Using an electric mixer, beat on high speed for about 5-6 minutes until the mixture has doubled in size.*
Scrape down the bowl to make sure everything is properly combined.
While mixing on low speed, slowly pour in the chocolate oil mixture.
Once it is fully combined, add the flour, cocoa powders, and salt, and fold until mostly combined.
Lastly, fold in the chopped chocolate until evenly dispersed
Pour the brownie batter into the prepared pan and smooth out the top with an offset spatula.
Bake the brownies for about 35 minutes.
Allow them to cool completely in the pan before removing.
Cut into 16 squares, top with flaky sea salt, and enjoy!