Begin by preheating your oven to 325°F (165°C).
Take out the turkey's giblets and neck from the cavity, then dry the turkey thoroughly with paper towels.
In a mixing bowl, combine the softened butter, olive oil, salt, pepper, garlic powder, onion powder, thyme, rosemary, and sage, stirring until the mixture is smooth and well-blended.
Carefully lift the skin over the turkey's breast and thighs, then spread half of the herb-infused butter beneath the skin. Use the remaining butter to coat the exterior of the turkey generously.
Fill the turkey's cavity with the quartered lemon and onion for added flavor.
Set the turkey on a roasting rack inside a large roasting pan, and pour the chicken broth into the bottom of the pan to keep the meat moist during cooking.
Roast the turkey in the oven, allowing approximately 13-15 minutes per pound, until the internal temperature reaches 165°F (75°C) in the thickest part of the thigh.
To achieve a crispy, golden skin, baste the turkey with the pan juices every half hour throughout the roasting process.
After the turkey is fully cooked, take it out of the oven and let it rest for 20-30 minutes to allow the juices to redistribute before carving.
Before serving, adorn the turkey with fresh herb sprigs for a beautiful presentation.