Ingredients
Method
Instructions
- Preheat your oven to 375°F (190°C). Grease a 10x15-inch jelly roll pan or similar sized baking sheet.
- In a large mixing bowl, whisk together flour, sugar, baking soda, and salt until well combined.
- In a medium saucepan, combine butter, water, and cocoa powder. Heat over medium heat, stirring constantly, until the butter melts and the mixture comes to a gentle boil.
- Pour the hot chocolate mixture over the dry ingredients and mix until just combined. The batter will be thick.
- Stir in sour cream, eggs, and vanilla extract until the batter is smooth and well blended.
- Pour the batter into your prepared pan and spread evenly. Bake for 18-22 minutes, or until a toothpick inserted in the center comes out clean.
- While the cake bakes, prepare the icing. In the same saucepan, combine butter, cocoa powder, and milk. Bring to a boil, then remove from heat.
- Whisk in powdered sugar and vanilla until smooth. Stir in chopped pecans if using.
- Pour the warm icing over the hot cake as soon as it comes out of the oven. Spread evenly with a spatula.
- Allow the cake to cool completely before cutting into squares and serving.
Notes
Measure accurately by spooning flour into measuring cup and leveling off. Don't overmix the batter once wet ingredients are added. Timing is crucial - icing should be ready to pour immediately when cake comes out of oven. Cake tastes even better the next day as flavors develop.
