Greek Yogurt (Best Option)
1:1 (1/4 cup Greek yogurt per 1/4 cup sour cream)Greek yogurt is strained to remove whey, resulting in a thick, creamy texture similar to sour cream. It contains live cultures that provide the necessary tanginess, which complements the sweetness of fruits in smoothies.
For best results, use plain, unsweetened Greek yogurt to avoid altering the smoothie’s flavor profile. If the yogurt is too thick, thin it slightly with a splash of milk or water before blending.
Compared to sour cream, Greek yogurt yields a slightly higher protein content and a cleaner tang, which can brighten the smoothie without adding excess fat.