INGREDIENTS
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1 cup unsalted butter (plus more for preparing pan)
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3 ounces semisweet chocolate, finely chopped
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1 cup granulated sugar
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1/2 cup cocoa powder
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1/2 cup mascarpone cheese, softened
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3 large eggs, at room temperature
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2 teaspoons vanilla extract
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1/2 cup all-purpose flour
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1/4 teaspoon salt
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6 ounces semisweet chocolate, finely chopped
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6 tablespoons heavy cream
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3 tablespoons unsalted butter