Preheat oven to 325°F (163°C).
Remove giblets and neck from inside the turkey. Pat turkey dry with paper towels.
If removing the plastic leg holder, do so now and tie legs with twine.
Rub the entire turkey with the softened butter, including under the skin if possible.
Sprinkle salt, pepper, garlic powder, onion powder, and paprika all over the bird.
Stuff the cavity with lemon, garlic, rosemary, thyme, and onion.
Place the turkey breast-side up on a rack in a large roasting pan.
Add broth to the bottom of the pan to keep the meat moist.
Cover loosely with foil and roast for about 15 minutes per pound. For a 12-lb turkey, that’s roughly 3 hours.
Remove foil for the last 30–45 minutes to brown the skin.
Use a meat thermometer to check the internal temperature:
165°F (74°C) in the thickest part of the breast
175°F (80°C) in the thigh
Let the turkey rest for 20–30 minutes before carving.