INGREDIENTS
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2 tablespoons unsalted butter, at room temperature
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2 oz bittersweet or semisweet chocolate, chopped
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1/4 teaspoon vanilla extract
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1 large egg, at room temperature
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2 tablespoons granulated sugar
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pinch of salt
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1 tablespoon all-purpose flour
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cocoa powder (for the ramekins)
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confectioners' sugar (for dusting, optional)