"Very rich..."
INGREDIENTS
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1 (19 1/2 ounce) package brownie mix
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1/2 cup unsalted butter, melted
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1/4 cup buttermilk
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1 tablespoon vanilla extract
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2 large eggs
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1 1/2 cups powdered sugar, sifted
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1 1/2 tablespoons unsalted butter, melted
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1 teaspoon vanilla extract
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1 -2 teaspoon milk