Embodiments of the inventive concept provide a dual-fuel gas-pellet burner assembly. The dual-fuel gas-pellet burner assembly can include a cooking gas line, a cooking gas igniter, a motor-driven pellet auger, a combustion air channeling section enclosing the motor-driven pellet auger and at least a section of the cooking gas line, and a dual-fuel sectioned combustion chamber including a gas combustion section and a fire pot section. The gas combustion section includes a terminal end of the cooking gas line and the cooking gas igniter disposed therein. The fire pot section includes a terminal end of the motor-driven pellet auger disposed therein. The gas combustion section of the dual-fuel sectioned combustion chamber is partitioned off from the fire pot section by an internal separator wall. A control unit including a digital temperature display, a temperature dial, and a switch can receive a user selection among three different modes of operation.