• Sift together sugar, flour and cocoa in a bowl.
• In a saucepan, bring to boil 1 cup cold water, margarine and oil.
• Stir in dry ingredients and mix until creamy.
• Add buttermilk, baking soda, eggs and vanilla; beat well.
• Bake at 350° in 9×13-inch dish treated with nonstick spray and bake 30 minutes.
• Cool and frost with Chocolate Butter Icing

Chocolate Butter Icing:

• Combine sugar, butter and milk in a nonstick saucepan.
• Bring to a full rolling boil, then remove from heat.
• Add chocolate chips and nuts.
• Stir and spread over brownies.