Preheat the oven to 350°F and grease a 9x13-inch cake pan with butter and line with parchment paper, letting the paper come up over the edge for easy removal.
In a large bowl, whisk together the sugar, flour, cocoa powder, baking soda, baking powder, espresso powder, and salt. Set aside.
2 cups granulated sugar, 2 cups all-purpose flour, 1 cup unsweetened cocoa powder, 2 teaspoons baking soda, 2 teaspoons baking powder, 1 teaspoon espresso powder, 1 teaspoon kosher salt
In a separate mixing bowl, beat together the eggs and sour cream until smooth. Then beat in the oil and vanilla until creamy.
2 large eggs, 1 cup sour cream, ½ cup vegetable oil, 2 teaspoons vanilla extract
Add the egg mixture to the dry ingredients and stir just a little to begin incorporating, then pour in the hot water and stir until smooth.
1 cup hot water
Pour the batter into the prepared cake pan and bake for 35 to 40 minutes or until a toothpick comes clean from the center of the cake.
All the cake to cool completely before frosting.