Preheat the oven to 350F.
Butter and flour 2 (9-inch) round cake pans, or lightly spray with baking spray, and line the bottoms with parchment paper.
Add the flour, baking soda, salt, and baking powder to a large bowl and whisk to combine. Sift the ingredients and set aside until needed.
Add the room temperature butter to the bowl of a stand mixer fitted with the paddle attachment (or a large bowl with a hand mixer). Beat on medium speed until creamy (3-4 minutes)
Sift the cocoa.
Add the sifted cocoa powder and vegetable oil to a medium bowl. Whisk to fully combine.
Add the cocoa mixture, granulated sugar, and brown sugar to the creamed butter. Beat on medium speed until very light and fluffy (4-5 minutes).*Scrape the sides and bottom of the bowl as needed. Add the eggs, one at a time to the mixture while beating on low speed. Mix each egg into the mixture before adding the next egg. *Scrape the sides and bottom of the bowl as needed. Add the vanilla extract into the mixture, whip to combine.
Add the sour cream and mix to combine.
Add one-third of the flour mixture to the cake batter and mix just enough to combine.
Add half the milk, mixing just enough to combine.
Repeat the process by adding one-third of the flour mixture, then the remainder of the milk, followed by the remainder of the flour mixture.
Carefully add the hot coffee to the batter and stir the coffee in just enough to combine.
Divide the batter equally between the prepared cake pans.
Bake for 40 to 45 minutes or until the cakes are starting to pull away from the sides of the pans and the center springs back when gently pressed.
Let the cakes cool completely in the pans.
Carefully invert the cakes and remove the parchment paper, then let them finish cooling on a wire rack (the cakes are very tender and delicate, so be gentle).