Finely chop the chocolate and place it in a medium/large heatproof mixing bowl.
Measure 200g cream into a small saucepan and place it over a low/medium heat. Cook until the cream is hot to the touch but not bubbling furiously, about 2 minutes.
Pour the hot cream over the chopped chocolate and place the chopping board on top to act as a lid. Allow this to sit for 1-2 minutes to completely melt the chocolate.
Remove the chopping board and stir the mixture to combine. It should be a lovely medium chocolate brown in colour and a smooth, pourable consistency. Set aside to cool a little.
In another mixing bowl, use hand beaters to whip the cream and icing sugar together. If you're not sure how sweet you would like the mousse, add a lesser amount of sugar. You can add more after you mix in the chocolate.
Once the cream is whipped, it should look light and fluffy. It won't whip to firm peaks the way that regular cream does, but it should have faint beater tracks on the surface. This brand of vegan cream is very hard to over-whip.
Add the slightly cooled chocolate mixture with the beaters still going. Continue to beat on a medium speed until the mixture is combined and chocolate brown in colour.
Add any optional flavour enhancers here. Test to see that the mousse is sweet enough for your liking and add more sieved icing sugar if necessary. Mix to combine.
Decant the chocolate mousse into your serving vessel/s of choice. I have used 6 X 180ml capacity (3/4 cup) serving glasses. You can also put the mousse in a bowl and serve it in scoops, but I find individual glasses look more generous and also make for the airiest mousse.