INGREDIENTS
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3 sticks (339g) unsalted butter, softened (do not soften in the microwave)
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8 ounces (227g) white baking chocolate (I used 2 Ghirardelli Premium Baking Bars)
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4 1/2 cups (518g) powdered sugar
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1 teaspoon (4g) vanilla extract
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4 tablespoons (42 g) milk or cream