Prep. Preheat oven to 350º F. Prepare the loaf pan by buttering and lightly dusting with cocoa powder or flour or spreading with chocolate cake goop.
Whisk together the dry ingredients. Add flour, sugar, cocoa, baking powder, baking soda, salt, and espresso powder to a large bowl. Whisk until combined well.
Stir together the wet and dry ingredients. Add the milk, oil, egg, and vanilla extract to the flour mixture and stir together. Carefully add boiling water to the cake batter until well combined.
Bake the cake. Pour the cake batter into the prepared loaf pan. Bake for 30-35 minutes until a toothpick or cake tester inserted in the center of the chocolate cake comes out clean. See my guide for how to tell when your cake is done for more tips.
Cool the cake. Remove from the oven and allow to cool for about 10 minutes. Remove from the pan and cool completely.
Nutrition information does not include frosting. If you live in a high-altitude area, adjust to the altitude for your specific area. You can omit the espresso powder from the recipe if you prefer or if you do not have it available.
Storage Tips:
To store. Cool the cake and store it on a cake plate or platter covered with a cake dome or wrap it at room temperature. If you add a frosting that requires refrigeration, such as cream cheese frosting, wrap the cake well and store it in the refrigerator.To make ahead. This cake is a wonderful make-ahead cake recipe! Prepare it as directed, wrap it well or store it under a cake dome.To freeze. Wrap the cooled cake well with wrap and then with foil. Put inside an airtight, freezer-safe container and freeze for up to two months. To serve, thaw in the refrigerator overnight with the wrapping left intact.