Place your turkey breast-side down on a sturdy cutting board. Using sharp kitchen shears, cut along both sides of the backbone from tail to neck and remove it completely. Save the backbone for stock later.
Flip the turkey breast-side up. Slide your fingers along each side of the breastbone to loosen it from the meat, then gently pull it out. This helps the bird cook evenly and makes carving easier later.
Rinse the turkey (if desired) and pat it completely dry with paper towels. Moisture on the surface prevents crisp skin, so make sure it’s dry all over.
Gently use your fingers to separate the skin from the meat, creating small pockets over the breast and thighs. Be careful not to tear the skin — this space is where the butter will go later.
Sprinkle SPG (salt, pepper, granulated garlic) evenly all over the turkey, including under the skin if possible.
Place the seasoned turkey on a rack set over a sheet pan and refrigerate uncovered for 24 hours. This step helps the skin dry out and the meat absorb flavor.
The next day, slice cold butter into thin pieces and tuck them under the skin, spreading them evenly across the breast and thighs. This helps baste the turkey from the inside as it cooks.
Set your Traeger or pellet smoker to 225°F and preheat it with your choice of pellets — apple, cherry, or hickory work great.
Place the turkey directly on the grill grates, breast side up. Insert one temperature probe in the breast and another in the thigh to monitor both zones. Smoke the turkey for about 30–40 minutes per pound, or roughly 10–12 hours for an 18-pound bird. The spatchcocked shape helps it cook evenly throughout.
The turkey is done when the thighs reach 195°F and the breast reaches 175°F.
For extra-crispy, golden skin, raise the smoker temperature to 375°F for the last 30 minutes of cooking.
Remove the turkey from the smoker and let it rest for at least 20 minutes before carving. This allows the juices to redistribute for the best flavor and texture.