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Preheat oven to 350 degrees F and grease a 18×13” pan.
Add water butter cocoa powder to a medium saucepan over medium heat. Bring mixture to a boil.
Meanwhile, in a separate bowl mix together the flour, sugar baking soda and salt.
In another small bowl mix together the sour cream, eggs and vanilla.
Add sour cream/egg mixture to the flour mixture and mix until combined.
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.
Pour mixture into prepared pan and smooth with a spatula to make sure it is dispersed in an even layer.
Bake in preheated oven for 15-20 minutes or until set (mine is usually done around 15 minutes).
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