Chill your tools: Place a mixing bowl and beaters in the fridge for 10 minutes.
Cold tools help the cream whip faster and fluffier.
Whip the cream: Pour cold heavy cream into the chilled bowl. Beat on medium-high until soft peaks form. Do not overbeat.
Set aside.
Soften the cream cheese: In a separate bowl, beat the room-temperature cream cheese until smooth and lump-free.
Add the dry ingredients: Sift in cocoa powder and powdered sweetener. Add a pinch of salt. Beat until fully combined and glossy.
Flavor it: Mix in vanilla extract.
If using, add 1/2 teaspoon espresso powder to deepen the chocolate flavor.
Lighten the base: Gently fold one-third of the whipped cream into the chocolate base to loosen it. Use a spatula and light strokes.
Finish folding: Add the remaining whipped cream in two additions, folding just until no streaks remain. Keep it airy.
Taste and adjust: If you want it sweeter, fold in a little more powdered sweetener.
If too thick, add a splash of cream and fold gently.
Chill or serve: Spoon into serving dishes. Chill for 30–60 minutes for a firmer set, or enjoy immediately for a softer mousse.
Garnish: Top with a dollop of whipped cream, cocoa dusting, sugar-free chocolate shavings, or a few raspberries.