Melt the dark chocolate in a double boiler: Place the chocolate in a bowl and set it over a saucepan of simmering water. Make sure the bottom of the bowl doesn't touch the water.
In another bowl, whisk the egg yolks with the powdered sugar until light and fluffy. Add the melted dark chocolate to the egg yolk mixture and stir until smooth.
In a separate bowl, whip the heavy cream until stiff peaks form, being careful not to overwhip it.
Gently fold the whipped cream into the chocolate egg yolk mixture in batches, being mindful to maintain the light and airy texture.
Pour the mixture into a loaf pan or a silicone mold and place it in the freezer. Freeze for at least 4-6 hours, or preferably overnight for the flavors to meld together even better.
Before serving, remove the parfait from the freezer 5 minutes beforehand to make it easier to slice. Use a knife dipped in warm water to easily cut through the parfait.
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