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.