6 tbsp buttermilk
1 tsp vanilla extract
¼ tsp salt
3½ cups powdered sugar
½ cup chopped walnuts or pecans optional
Instructions
Make the Cake
Preheat oven to 350°F (175°C). Grease and flour a 9″x13″ cake pan.
In a large bowl, whisk together flour, sugar, baking soda, and salt. Set aside.
In a small saucepan, combine butter, cocoa powder, and water. Heat over medium-low, whisking until butter melts and mixture is smooth.
Pour cocoa mixture into dry ingredients and stir until just combined.
Add buttermilk, eggs, and vanilla. Mix gently until batter is smooth.
Pour into prepared pan and bake for 28–32 minutes, or until a toothpick inserted in the center comes out clean.
Let cake cool completely in the pan.
Make the Frosting
In a small saucepan, melt butter over medium-low heat.
Add cocoa powder and buttermilk, whisking constantly for 1 minute until mixture resembles thin pudding.
Remove from heat and stir in vanilla, salt, and powdered sugar until smooth.
Immediately pour warm frosting over cooled cake and spread evenly.
Sprinkle with chopped nuts if desired.
Let frosting set for at least 1 hour before slicing into 15 squares.
ADVERTISEMENT
