Preheat oven to 325F
Line 9x13 pan with nonstick foil
In a pot, heat the water to a simmer.
Add cocoa and chocolate.
Remove from heat and stir smooth.
In a large bowl, melt the butter in a microwave.
Add sugar and vanilla.
Add the chocolate mixture.
Add eggs/yolks and salt stirring well.
Add flour to combine.
Pour in pan and bake 325 for 20 mins.