Preheat oven: Set oven to 425°F.
Prepare bird: Pat turkey (or chicken) dry with paper towels, removing any moisture from the skin.
Make herb butter: In a bowl, mix softened butter, garlic, herbs, lemon zest, lemon juice, salt, and pepper.
Loosen skin: Gently lift the skin over the breast and thighs, and rub half the butter mixture underneath the skin. Spread remaining butter over the entire surface of the bird.
Roast: Place in a roasting pan on a rack. Roast for 20 minutes, then reduce oven temperature to 350°F.
Baste: Every 30 minutes, brush the bird with pan juices or melted butter. Add broth to the pan if it begins to dry out.
Check temperature: Cook until internal temperature reaches 165°F in the thickest part of the breast.
Rest and carve: Remove from oven, tent with foil, and rest for 20–30 minutes before carving. Garnish with fresh herbs and lemon slices.