Ingredients
Method
- Cream the 1 cup butter, 1 1/2 cups granulated sugar, and 1/2 cup brown sugar with a mixer on medium-high for 3 to 4 minutes until pale and fluffy.
- Beat in the 4 eggs one at a time, then the 1 tsp vanilla. Beat until combined; the batter will look thick and glossy.
- In a separate bowl, whisk the 1 3/4 cups flour, 3/4 cup cocoa, 1 tsp espresso powder, 1 tsp baking powder, 1/2 tsp baking soda, and 1/2 tsp salt. Add to the butter mixture in three parts, alternating with the 1/2 cup sour cream in two parts, starting and ending with flour. Mix on low just until no streaks remain.
- Scrape batter into a greased 9x5-inch loaf pan, smooth the top, and bake at 350°F (175°C) for 60 to 70 minutes, until a toothpick has moist crumbs. Cool in the pan 10 minutes, then turn out onto a rack to cool completely.
- Once fully cool, slice and dust generously with powdered sugar.
Notes
Wrap the cooled cake tightly and let it sit overnight for even better flavor—the chocolate deepens and the crumb stays moist. If you prefer a glaze, whisk 1 cup powdered sugar with 2 tbsp milk and 1/2 tsp vanilla and drizzle over the cooled cake.
