Preheat the oven to 350°F (175°C). Grease and flour three 8-inch round cake pans.
In a large bowl, whisk together flour, sugar, cocoa powder, baking powder, baking soda, and salt.
Add milk, eggs, sour cream, oil, espresso powder, vanilla extract, and hot water. Mix until smooth.
Bake for 25-30 minutes or until a toothpick inserted comes out clean. Let cool in pans for 10 minutes, then transfer to a wire rack to cool completely.
Assemble the cake by spreading ganache between layers and frosting the outside with whipped cream.
Notes
For a lighter texture, ensure all refrigerated ingredients are at room temperature before mixing.