Sour Cream (Best Option)
1/4 cup sour cream per 1/4 cup Greek yogurtSour cream is cultured cream with a tangy flavor profile and creamy texture similar to Greek yogurt, making it an excellent substitute in tomato sauce. Its acidity helps balance the tomato's natural acidity, preventing the sauce from tasting flat.
To avoid curdling, add sour cream towards the end of cooking and gently warm it through rather than boiling. Stir continuously to integrate smoothly.
The final sauce will have a slightly richer mouthfeel and similar tang, with minimal difference in texture or flavor compared to Greek yogurt.