Heat milk in a microwave safe bowl for 30 seconds. Add chopped butter and stir. Allow to sit for 2-3 minutes so the butter further softens.
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Recipe adapted from Land o Lakes. Chocolate frosting below is suggested by Land O Lakes. *For frosting, blend together 4 tablespoons butter, softened with 1 cup powdered sugar and 1/4 teaspoon unsweetened cocoa. After well blended, add 1/2 ounce semi-sweet chocolate, melted and 2 tablespoons cream or whole milk until a spreadable consistency.