Preheat the oven to 350 degrees F. Using a food processor, or a large ziplock bag and rolling pin, blend 2 Oreos until they resemble fine crumbs. Remove 2 tablespoons of Oreo crumbs to add to the batter. Set the rest of the Oreo crumbs aside and save them when decorating the top of the bread.
In a large mixing bowl, sift together the cake flour, Dutch process cocoa powder, black coca powder, baking powder, baking soda, and kosher salt. Whisk in the granulated sugar and Oreo crumbs with the flour mixture, whisking until combined. Set aside.
2 (250 g) cups Cake flour, ¼ (21 g) cup Dutch process cocoa powder , ¼ (21 g) cup Black cocoa powder, 2 ½ teaspoons Baking powder, ½ teaspoon Baking soda , ½ teaspoon Kosher salt , 1 (224 g) cup, plus 2 tablespoons Granulated sugar , 2 tablespoons Oreo cookie crumbs
In a medium bowl, whisk together the eggs and sour cream until smooth. Then mix in the vegetable oil, buttermilk, and vanilla extract.
½ (120 g) cup Sour cream , 2 large Eggs , ¾ (180 g) cup Buttermilk , ½ (112 g) cup Vegetable oil , 1 tablespoon Vanilla extract
Pour the wet ingredients into the dry ingredients and mix using a rubber spatula until just combined and no streaks of flour remain.
Spray a 9x5 loaf pan with non stick baking spray and line the long side of the pan with parchment paper. The parchment paper should make a sling and hang off the sides for the pan for easy removal. Pour the batter into the prepared pan and smooth with the back of a spoon or offset spatula. Tap the pan a few times on the counter to remove any air bubbles.
Bake for 50 - 55 minutes or until a cake tester or wooden skewer inserted into the center comes out mostly clean with a few moist crumbs. The bread should have a dome shape and bounce back when lightly pressed. (To check for doneness I like to stick a wooden skewer in the center of the cake to make sure there is no wet batter.)
Allow the bread to sit in the pan on a cooling rack for 10 minutes. Then, using the parchment overhang, lift the bread out of the pan and place onto the cooling rack. Let the bread cool completely before glazing and topping with the Oreo crumbs and crushed Oreos.