INGREDIENTS
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1 14-oz. can sweetened condensed milk
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1 cup semisweet chocolate chips, melted
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Butter, for greasing
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Flour, for pan
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1 box chocolate cake mix, plus ingredients called for on box
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Chocolate shavings, for garnish
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1 cup butter, softened
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2 1/2 cups powdered sugar
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3/4 cup cocoa powder
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2 teaspoons pure vanilla extract
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pinch of salt
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1/4 cup heavy cream (plus more if necessary)