Begin by melting the chocolate using a microwave-safe bowl in 20-second intervals, stirring between each until smooth, or use a double boiler. Set aside to cool slightly.
In a mixing bowl, whisk together the egg yolks and white sugar until pale and slightly thickened.
Heat the heavy cream in a saucepan over medium heat until just about to simmer, then remove from heat.
Gradually pour the warm cream into the egg yolk mixture while whisking constantly to temper the eggs. Then add the melted chocolate and a pinch of salt, whisking until well combined.
Pour the chocolate mixture into ramekins or small jars, filling about three-quarters full.
Add one cup of water to the Instant Pot's inner pot, place the trivet inside, and arrange the filled ramekins on top. Secure the lid and set the valve to sealing.
Set the Instant Pot to “Manual” or “Pressure Cook” for 8 minutes. After cooking, allow a natural pressure release for 10 minutes, then quickly release any remaining pressure.
Remove the pots de crme from the Instant Pot and let cool at room temperature for 30 minutes. Refrigerate for at least 2 hours or until fully set.