Preheat oven to 350 degrees F. Line an 8 inch metal pan (do not use glass) with nonstick foil.In a saucepan, melt the butter over medium heat.
Add the chocolate, remove pan from heat and stir until chocolate melts in the hot butter. If residual heat doesn’t melt the chocolate enough, put the pan back on low.Stir the grapeseed oil into the melted chocolate, then stir in the cocoa. The mixture will look like thick, black, mud.In a mixing bowl, whisk the eggs, egg white, sugar and vanilla.
Whisk in the baking powder and the salt, then scrape in to thick chocolate mixture and stir well. Stir in the flour. When well mixed, stir in the chocolate chips.
Bake on center rack for 30 minutes or until brownies appear set.
Let cool completely on a rack. Lift from pan and slice into squares or for a cleaner cut, chill for a few hours and then cut. I always chill mine before cutting, then serve at room temperature.