"For more information about melting chocolate, see Meltdown...."
INGREDIENTS
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2 cups all-purpose flour
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2/3 cup unsweetened cocoa powder (not Dutch-process)
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1 1/2 teaspoons baking soda
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1/2 teaspoon salt
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2 sticks (1 cup) unsalted butter, softened
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1 cup packed dark brown sugar
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3/4 cup granulated sugar
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4 large eggs at room temperature for 30 minutes
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2 oz unsweetened chocolate, melted and cooled
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1 1/2 teaspoons vanilla
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1 1/2 cups well-shaken buttermilk
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2/3 cup whole milk
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3 large egg yolks
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1 tablespoon plus 1 teaspoon all-purpose flour
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1 1/3 cups confectioners sugar
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1 teaspoon vanilla
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3 sticks (1 1/2 cups) unsalted butter, cut into tablespoon pieces and softened
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8 oz milk chocolate, melted and cooled
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2 oz unsweetened chocolate, melted and cooled