In large bowl mix flour and sugar together, set aside.
In saucepan combine butter, shortening, water and cocoa.
Stir and heat to boiling.
Pour boiling mixture over the flour and sugar, mix well.
Add buttermilk, eggs, baking soda and vanilla.
Mix well.
Spray cookie sheet with pam.
Bake at 400 for 20 minute.
While brownies bake prepare the frosting.
Combine melted butter, cocoa and salt.
Add milk and vanilla.
Stir in icing sugar in 3 parts.
Mix until smooth.
Spread over browines as soon as they are out of the oven.
