Ingredients :

• Cream cheese — The foundation of it all. Use full-fat, not the light version—the final texture depends entirely on the fat content. Classic Philadelphia works great, as does a store brand, as long as it’s at least 30% fat. Take it out of the fridge a bit early to avoid lumps when whisking.
• Heavy cream — It must be cold, taken out of the fridge just before use. This is what allows it to whip into firm peaks. The 30% or higher version is essential here. Light cream won’t set, and you’ll end up with a white liquid instead of a mousse.
• Powdered sweetener — Fine powdered erythritol (confectioners’ style) is the easiest option to incorporate without an unpleasant grainy sensation. Stevia also works, but with a much smaller dose. Taste and adjust—it’s easier here than in any other recipe since everything is raw.
• Vanilla extract — Half a teaspoon is enough. Use natural extract if possible—artificial flavoring has a slightly chemical aftertaste that stands out in a dessert as simple as this.