Whisk the brown sugar so that it is free of lumps. Remove any hard bits that could disrupt the texture of your frosting. Then lightly pack the sugar.
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In a mixing bowl, add the butter, cream cheese, vanilla extract, and the brown sugar.
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Use a mixer on medium speed to blend the ingredients for at least 2 minutes. Aim for a smooth consistency where the brown sugar has dissolved, eliminating any graininess.
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Scrape down the sides of the bowl with a spatula to ensure all ingredients are incorporated evenly.
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