Flames were first reported at 5:39 a.m. at the Burger King restaurant located on the 7800 block of Route 130.
Investigators say the fire started in the kitchen and spread up into the roof.
The employees got out immediately and no injuries were reported.
Fire crews from surrounding towns were called in to help fight the fire before it was declared under control at 6:21 a.m.
There was significant damage to the building. The cause is still being investigated.