Preheat oven to 350 degrees.
Butter three 8-inch cake pans. Dust cake pans with flour and set to the side.
In a stand mixer, add cocoa powder, salt, granulated sugar, all-purpose flour, baking soda, and baking powder. Mix on low.
Meanwhile, add the instant espresso to a cup of boiling water.
While mixer is on low, add vanilla, whipping cream, oil, and eggs, followed by the espresso and water mixture, and continue to beat until fully mixed. This process will take up to 4 minutes. Once the batter is smooth, distribute the mixture into the 3 floured pans.
Place pans in the oven and bake for 30–40 minutes. To check for doneness, stick the center of a cake with a cake tester or toothpick and make sure it comes out clean. Let the cakes cool for up to an hour.
Once cakes are done cooling, trim the cakes to make sure all layers are the same (do not throw away excess pieces—they are a great snack!). Once you finish trimming your layers to your liking, it’s time to ice, slice, and enjoy!