INGREDIENTS
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½ cup unsalted butter, slightly cooler than room temperature
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1 cup sugar
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2 large eggs, just at room temperature
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⅔ cup sour cream (full-fat)
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2 teaspoons vanilla extract
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1 ½ cups all-purpose flour
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1 teaspoon baking powder
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½ teaspoon salt
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3 ounces bittersweet chocolate, melted and cooled
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2 teaspoons cocoa powder, sifted
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4 ounces bittersweet chocolate, chopped
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¼ cup whipping cream
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2 tablespoons unsalted butter, cut into pieces