Ingredients
Method
Instructions
- Preheat oven to 350°F (175°C). Grease and flour a 12x17-inch jelly roll pan. In large mixing bowl, whisk together flour, sugar, and salt until well combined.
- In medium saucepan, combine butter, water, and cocoa powder. Bring to boil over medium heat, stirring constantly. Remove from heat and pour hot chocolate mixture over dry ingredients. Stir until well combined.
- In small bowl, whisk together eggs, buttermilk, baking soda, and vanilla extract. Add this mixture to chocolate batter and stir until smooth and well incorporated.
- Pour batter into prepared baking sheet and spread evenly. Bake for 18-20 minutes or until toothpick inserted in center comes out clean.
- While cake bakes, prepare icing: In saucepan, combine butter, cocoa powder, and buttermilk. Bring to boil, then remove from heat.
- Gradually whisk in powdered sugar until smooth, then stir in vanilla extract and nuts (if using).
- Remove cake from oven and immediately pour warm icing over hot cake. Use offset spatula to spread evenly.
- Allow cake to cool completely before cutting into squares.
Notes
Use high-quality cocoa powder for best flavor. Ensure eggs and buttermilk are room temperature. Don't overmix batter. Pour icing over cake immediately after baking. Cake improves in flavor after a day as icing soaks in.
