The Muncie Fire Department was dispatched to the Dairy Queen in the 3800 block of W. Bethel Ave shortly before 4 p.m Monday.
No one was trapped inside when the fire department arrived.
The Battalion Chief on scene said it appears the fire started in the storage area cooler and spread into the attic via an exhaust pipe.
Indiana Michigan Power was called to the scene to turn the power off as a precautionary measure.
No injuries were reported. Delaware County EMS were called to the scene as a standby precaution.
This story will be updated.