Preheat the oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper. Cut out 8 inch circles for the bottom of the pans.
In a large mixing bowl using a hand mixer or stand mixer, beat together the wet ingredients: eggs, vanilla extract, whole milk, sour cream, and vegetable oil.
In a separate bowl, beat together the dry ingredients: granulated sugar, all purpose flour, natural cocoa powder, baking soda, baking powder, and kosher salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Add 1 cup of hot coffee to the batter and beat until smooth. The batter will be thin, but that’s okay! Making sure to scrape the bottom of the bowl.
Divide the batter between the two prepared 8-inch cake pans. I like to weigh out or measure out the batter to make sure the layers are even.
Position it on the center rack of the oven to ensure even baking, avoiding placement too close to the top or bottom. Bake in the preheated oven for 20-22 minutes, or until a toothpick inserted into the center comes out clean (you can bake 2 cakes at a time)
Allow the cakes to cool in the pans for 10 minutes before transferring them to a wire rack to cool completely. I like to place a plate or rack on top of the cake pan with a sheet of parchment paper between them, then flip it over. The cake should release and fall out easily.