INGREDIENTS
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For the chocolate cake::
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1 3/4 cups all-purpose flour, plus more as needed
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1 teaspoon baking soda
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3/4 teaspoon fine salt
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2/3 cup Dutch-process cocoa powder
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2/3 cup boiling water
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2/3 cup whole milk, at room temperature
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12 tablespoons unsalted butter (1 1/2 sticks), at room temperature, plus more as needed
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2 cups granulated sugar
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2 teaspoons vanilla extract
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3 large eggs, at room temperature
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For the milk chocolate buttercream::
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6 ounces milk chocolate, coarsely chopped
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3 ounces bittersweet chocolate, coarsely chopped
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3 sticks (12 ounces) unsalted butter, at room temperature
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2 tablespoons whole milk
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1 teaspoon vanilla extract
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1/4 teaspoon fine salt
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2 1/2 cups powdered sugar
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For the whipped fudge filling::
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8 ounces bittersweet chocolate, finely chopped
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3/4 cup heavy cream
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1/3 cup light corn syrup
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To assemble::
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2 ounces bittersweet chocolate