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Add 1 cup of powdered sugar at a time to the bowl. Stir immediately after adding the powdered sugar.
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Continue until you have added all 3 cups of powdered sugar. Make sure that all of the powdered sugar has been blended with the melted butter.
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Add the milk and vanilla extract. Use an electric mixer to blend everything.
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Top the brownies with the frosting. Spread the frosting to cover each corner of the pan and evenly coat the enter of the brownies.
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When cooled, cut into bars.
