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Step 1
Preheat oven to 350 degrees F and grease a 18x13'' pan.
Step 2
Add water butter cocoa powder to a medium saucepan over medium heat. Bring mixture to a boil.
Step 3
Meanwhile, in a separate bowl mix together the flour, sugar baking soda and salt.
Step 4
In another small bowl mix together the sour cream, eggs and vanilla.
Step 5
Add sour cream/egg mixture to the flour mixture and mix until combined.
Step 6
Once the chocolate mixture in the saucepan in boiling, remove it from heat and pour it into the batter. Mix until combined and no lumps remain.
Step 7
Pour mixture into prepared pan and smooth with a spatula to make sure it is dispersed in an even layer.
Step 8
Bake in preheated oven for 15-20 minutes or until set (mine is usually done around 15 minutes).
Step 9
When the cake is about half-way through cooking, prepare the frosting.
Step 10
Add milk, cocoa and butter to a saucepan. Bring mixture to a boil.
Step 11
Once boiling, remove it from the heat and stir in powdered sugar. I like to beat the mixture with my hand-held mixer to get rid of any lumps.
Step 12
Pour hot icing over hot cake. Use a spatula to spread it evenly over the cake. Allow frosting to set for about 10 minutes before eating.