Remove giblets from the cavity and pat the chicken completely dry with paper towels. Do not rinse.
Prepare the chicken by removing the backbone, and flattening it.
Apply kosher salt, pepper, or your favorite BBQ rub to both sides of the spatchcocked chicken skin.
Fill the hopper with pellets, start up the pellet grill, and preheat to 300-350°F.
Place the spatchcocked chicken on the pellet grill grates with the breast side facing up.
Place an internal temperature probe into the middle of one of the chicken thighs.
Close the lid, cook the spatchcocked chicken for about 1 to 2 hours.
When the internal temperature of the thigh has reached 165°F, remove the chicken from the pellet grill.
Rest uncovered for 15 minutes — do not cover with foil or the skin will soften. Carve and serve immediately.
Carve, plate, and serve immediately. Enjoy!