It happened just before 5 p.m. on the 2800 block of Overland Road.
No one was injured and the sprinkler system was activated. The fire department says two units were training just blocks away and were able to get to the scene in a matter of minutes.
Crew cut holes in the roof for ventilation in to make sure fire had not spread to the attic.
While a small fire was found inside the restaurant, crews are still investigating to find out what happened.