⭐ Sour Cream (Best Nut-Free Option)
1:1 (1 cup sour cream per 1 cup Greek yogurt)Sour cream has a similar fat content and tangy profile to Greek yogurt, which helps maintain the mousse's creamy consistency and flavor balance. The acidity in sour cream also aids in stabilizing the mousse structure.
When substituting, ensure sour cream is full-fat for best results, as low-fat versions can thin the mousse. Mix gently to avoid breaking the mousse's aeration.
The final mousse will have a slightly richer taste with a mild tang, very close to the original Greek yogurt version, preserving the intended mouthfeel and flavor complexity.