Preheat the oven to 350°F with the rack in the middle of the oven. grease two 8.5 x 4.5 Inch loaf pans and line with greased parchment paper to create a sling, set aside. In a bowl, whisk together the flour, cocoa powder, baking powder, baking soda, cinnamon, and salt.
In a stand mixer fitted with the whisk attachment, beat the sugar, brown sugar and eggs on medium speed for about 4 minutes. Mix in the vanilla and slowly drizzle in the oil while the beater is on medium low speed.
Remove the bowl from the mixer and use a rubber spatula to stir, alternate adding the dry ingredients and the mashed bananas in 3 batches, mixing just enough to combine them. Add the nuts and mix just to combine.
Pour the batter into the prepared pans and smooth out the top. Bake for about 1 hour or until a tester comes out clean. If the top is over browning after 45 minutes, gently drape the top with foil.