Preheat your oven to 400°F (220°C).
Using a spatula or whisk, combine the ingredients for the maple butter rub in a small bowl.
Line a baking sheet or roasting pan with a wire-rack. Then add the sliced orange, onion, and celery to the wire rack.
Place the spatchcocked turkey on top of the sliced oranges, onion and celery. Using gloved hands or a spatula, distribute the maple butter mixture under the skin and on top of the turkey on both sides. This helps achieve a golden and crispy exterior and infuses the turkey with juicy maple butter flavor.
Roast the spatchcocked turkey in the preheated oven for 30 minutes. Then, remove the turkey from the oven. Use a spoon or a syringe to baste the turkey with the drippings along the bottom of the pan. If you notice the skin getting too brown before the turkey is fully cooked, you can tent it with aluminum foil.
Place the turkey back in the oven and cook for another 40 minutes. While the turkey is roasting, prepare the maple butter glaze by whisking together melted butter and maple syrup in a small bowl.
Remove the turkey from the oven and pour or brush on the maple butter glaze. Lower the heat to 375°F and roast for an additional 20 minutes or until the internal temperature reaches 165°F (74°C).
Once cooked, let the turkey rest for at least 15-20 minutes before carving. This allows the juices to redistribute, keeping the meat moist.
Carve and serve your deliciously roasted spatchcocked turkey