Ingredients

• 1 cup unsalted butter or margarine, room temperature (use vegetable shortening when pure white icing is needed)
• 1/2 cup milk, room temperature
• 1/4 teaspoon salt
• 2 teaspoons vanilla or other desired flavoring
• 2 pounds confectioners' sugar

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Instructions

1. Combine all the ingredients in large mixing bowl and mix at slow speed until smooth. If stiffer icing is needed, or if the weather is very warm, add a little extra sugar. This recipe is enough to cover and fill a 9- by 13-inch sheet cake or two 9-inch layers.