In a medium-sized bowl, whisk the flour, cocoa powder, baking soda, salt, and baking powder together. Set aside.
1 cup all-purpose flour, ⅓ cup unsweetened cocoa powder, ½ teaspoon baking soda, ½ teaspoon kosher salt, ¼ teaspoon baking powder
In a separate, large bowl, whisk together the granulated sugar, butter, vegetable oil, and brown sugar until smooth and creamy. Whisk in the eggs. Add in the buttermilk, sour cream, espresso powder, and vanilla extract and whisk to incorporate. Mix in the flour mixture just until combined. Mix in the hboiling water until fully incorporated. The batter will be runny at this point.
¾ cup granulated sugar, ¼ cup unsalted butter, ¼ cup vegetable oil, 2 tablespoons brown sugar, 2 large eggs, ½ cup buttermilk, 3 tablespoons sour cream, ½ teaspoon espresso powder, 1 teaspoon pure vanilla extract, ½ cup boiling water