Preheat the oven to 350 degrees F. Line a 9x5 loaf pan with parchment paper.
In a medium bowl, mix together the flour, salt, and cocoa powder and set to the side.
Add about an inch of water into a small saucepan. Heat until it is begins to boil and turn off the heat, but do not remove the saucepan. Top with a heatproof bowl that is wide enough that it doesn't touch the hot water.
Add the chocolate, butter, oil, and sugars together in the heatproof bowl and mix until the chocolate is completely melted.
Remove from heat and allow to cool for a few minutes. Add in the egg and vanilla and beat well.
Add in the flour mixture and mix well for about 1 -2 minutes.
Pour the batter into the loaf pan and bake for about 20 minutes, or until a toothpick inserted in the middle comes out mostly clean. Allow to cool completely before cutting.
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