Sour Cream (Best Option)
1:1 (1/4 cup sour cream per 1/4 cup Greek yogurt)Sour cream works well because it shares a similar fat content and acidity level with Greek yogurt, which helps tenderize the meat and bind ingredients together. The lactic acid in sour cream also contributes to flavor complexity and moisture retention.
For best results, use full-fat sour cream and mix gently into the meat mixture to avoid breaking down the texture. Avoid overmixing to maintain the integrity of the meatballs.
Compared to Greek yogurt, sour cream may yield slightly richer meatballs with a subtle difference in tanginess, but overall the texture and moisture balance remain very similar.