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Preheat the oven to 375 degrees. Line an 11×16 pan with parchment paper and set aside.
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Put the flour and sugar in a large mixing bowl and set aside. In a large saucepan, put the margarine, shortening, cocoa powder and water together and bring to a boil {stirring constantly}. Pour the mixture into the flour mixture and mix well. Slowly add the buttermilk, baking soda, eggs and vanilla and stir until combined.
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Pour batter on to lined pan and bake at 375 for 18-22 minutes.
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To make the icing, place the margarine, milk and cocoa in a large saucepan and bring to a boil. Remove from heat, stir in powdered sugar and vanilla. Ice brownies while hot.
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Let set for 15-20 minutes and then serve. Yummm a roo!