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Preheat oven to 350 degrees. Butter four 6-ounce ramekins, then coat lightly with sugar, tapping out excess. In a microwave-safe bowl, combine butter and chocolate. Microwave until melted, about 1 minute; stir until smooth. (Or melt mixture in a heatproof bowl set over, not in, a pan of simmering water.)
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In a large bowl, whisk together sugar, eggs, yolks, flour, and salt; add chocolate mixture and whisk to combine. Fill each ramekin three-quarters full with batter; place on a rimmed baking sheet and refrigerate 15 minutes.
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Bake until center of a cake is soft but not wet when pressed, 27 to 30 minutes. Let cool 5 minutes. Serve cakes warm, topped with caramel and whipped cream.
Cook’s Notes
Lightly coating the ramekins with sugar helps the cakes rise as they bake and makes them easy to unmold before serving, if you like.