01 - Preheat oven to 325°F.
02 - Warm milk and heavy cream in a saucepan over medium heat until steaming without boiling.
03 - Remove from heat, add chopped chocolate and stir until fully melted and smooth.
04 - In a medium bowl, whisk eggs, granulated sugar, vanilla extract, and salt until thoroughly blended.
05 - Slowly pour warm chocolate mixture into egg mixture while whisking continuously to avoid curdling.
06 - Pass the combined mixture through a fine mesh sieve into a large measuring cup or bowl to ensure smoothness.
07 - Divide the mixture evenly among four ramekins.
08 - Place ramekins in a deep baking dish and pour hot water to reach halfway up the sides of the ramekins.
09 - Bake for 20 minutes until custards are set but slightly jiggly in the center.
10 - Remove ramekins from water bath, cool to room temperature, then refrigerate at least 1 hour before serving.