Greek Yogurt (Best Option)
1/4 cup Greek yogurt per 1/4 cup sour creamGreek yogurt has a thick, creamy texture and a tangy flavor profile similar to sour cream, making it an excellent substitute in beef stew. Its higher protein content helps maintain creaminess when heated, unlike regular yogurt which may separate.
To avoid curdling, temper the Greek yogurt by mixing a small amount of hot stew liquid into it before stirring it fully into the pot. Add it near the end of cooking and keep the heat low.
The final stew will have a slightly more pronounced tang and a rich, creamy texture close to that achieved with sour cream, enhancing the overall flavor balance without compromising the stew's integrity.