⭐ 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 acidity level to Greek yogurt, which helps activate baking soda or baking powder, contributing to a light and fluffy crumb. Its creamy texture maintains moisture and richness in the cake.
When substituting, use sour cream at the same volume as Greek yogurt. Avoid overmixing the batter to prevent deflating the leavening gases. Sour cream's tanginess complements vanilla well, so no flavor adjustments are typically needed.
The final cake will have a moist, tender crumb with a subtle tang, very close to the original Greek yogurt version, making it the most reliable substitute.