In a small bowl combine the butter, rosemary, salt, black pepper, garlic powder, onion powder, thyme, and sage. Gently spread the mixture under the skin of the turkey, working to cover the breasts and thighs evenly.
12 tablespoons unsalted butter, 3 tablespoons dried rosemary, 1 tablespoon kosher salt, 1/2 tablespoon black pepper, 1 1/2 teaspoons garlic powder, 1 1/2 teaspoons onion powder, 3/4 teaspoon dried thyme, 3/4 teaspoon dried sage