What is a key ingredient in the Black Bean Crunchwrap Supreme?

The Black Bean Crunchwrap Supreme prominently features sour cream, which adds a creamy texture and tangy flavor, enhancing the overall taste experience of the dish. Sour cream is a classic ingredient in many Taco Bell menu items, contributing to the balance of flavors and providing moisture, which is particularly important in a crunchy wrap that combines multiple components.

While guacamole, chicken, and rice might be found in various Taco Bell offerings, they are not core to the Black Bean Crunchwrap Supreme. Guacamole is typically an optional addition; chicken is not included in the black bean version of this item; and rice, though common in many Mexican dishes, is not a necessary component of this specific wrap.