Police say it happened just after 4 a.m. Wednesday at the Chevron gas station on the corner of Herndon and Brawley.
The cashier says a man wearing a Dallas Cowboys baseball hat and a bandana came into the store pointed a handgun at him and demanded cigarettes, lottery scratchers and cash.
The cashier said he handed over the merchandise and about $100 in cash.
He last saw the suspect driving down Brawley.
No one was hurt during the crime.
This story is developing.