01 - Preheat the oven to 390°F. Generously butter two 6.8 oz ramekins and dust them with a little sugar, tapping out the excess to ensure even rising.
02 - Set a heatproof bowl over simmering water. Add the chopped chocolate, butter, and milk. Stir continuously until completely smooth and glossy, then remove from heat to cool slightly.
03 - In a spotless bowl, beat the egg whites with salt until soft peaks form. Gradually sprinkle in the granulated sugar while whisking until the meringue becomes glossy and holds stiff peaks when the whisk is lifted.
04 - Whisk the egg yolks and vanilla extract into the slightly cooled chocolate mixture until completely smooth and uniform.
05 - Gently fold one-third of the meringue into the chocolate base to lighten the mixture. Carefully fold in the remaining whites until just combined, maintaining as much air as possible.
06 - Divide the soufflé mixture evenly between the prepared ramekins. Run your thumb around the inside rim of each ramekin to create a clean edge, helping the soufflés rise evenly.
07 - Bake for 12–15 minutes until the soufflés have risen significantly with a slight wobble in the center. Avoid opening the oven door during baking.
08 - While the soufflés bake, whip the cold heavy cream with powdered sugar and vanilla extract until soft peaks form. Do not overbeat.
09 - Dust the warm soufflés with confectioners sugar and serve right away with a generous dollop of vanilla cream on the side.