Greek Yogurt (Best Option)
1:1 (1 cup Greek yogurt per 1 cup sour cream)Greek yogurt has a similar protein content and acidity level as sour cream, which helps in tenderizing the doughnut dough and activating baking soda for proper leavening. Its creamy texture ensures the dough remains moist without becoming runny.
For best results, use full-fat Greek yogurt and avoid overly thick or strained varieties that might dry out the dough. Stir the yogurt well before measuring to ensure consistency.
Compared to sour cream, Greek yogurt yields doughnuts with a slightly tangier flavor and a tender crumb, closely matching the original texture and rise.