A few days after Adelaide's first Krispy Kreme outlet opened in West Croydon two teenagers were robbed of their doughnuts by a knife-wielding sweet-tooth.

A KNIFE-WIELDING bandit with a craving for sweet treats has robbed two teenagers of six boxes of doughnuts, after they waited in line at Adelaide’s new Krispy Kreme store.

About 9.40pm last night two teenage boys got into their car on Malcolm St at West Croydon, when a man approached them.

He threatened the pair with what looked like a knife and demanded the pair stay in their car while he opened the rear passenger seat door to steal the treasured treats.

The victims were not physically hurt and the robber did not demand anything else.

The suspect is described as a man of caucasian appearance, approximately 165cm tall, aged between 16-20 years old.

He was wearing a black hooded jumper and black trackpants and was last seen running south on Malcolm St.

The robbery comes just a few days after Adelaide’s first Krispy Kreme outlet opened on Monday.

Keen fans have been seen lining up outside the store for hours.

Police urge anyone with information about the robbery to contact Crime Stoppers on 1800 333 000 or report online sa.crimestoppers.com.au.