Preheat the oven to 450°F (230°C). Grease ramekins with butter and dust them with flour, placing them on a baking sheet.
Melt the butter and bittersweet chocolate together using a double boiler or microwave, stirring until smooth.
In a large bowl, whisk together the eggs, egg yolks, sugar, and salt until thick and pale yellow.
Fold the melted chocolate mixture into the egg mixture, then sprinkle in the flour and fold until just combined.
Divide the batter evenly among the prepared ramekins. Bake for 6 to 8 minutes, until the edges are firm but the center remains soft.
Let the ramekins cool for 1 minute, then invert onto plates and serve immediately. Dust with powdered sugar and add fresh berries or whipped cream as desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 2 days. Reheat gently in the microwave before serving.