Let the turkey rest for 1 hour at room temperature. Then remove the neck, giblets, and any pin feathers left behing. Preheat the oven at 350°F near the end of resting.
Pat dry the skin of the turkey with a paper towel including the inside cavity. Season the inside cavity with 1 tsp of salt, 1/2 tsp black pepper, and 1 tbsp of onion powder. After seasoning, stuff it with 7 smashed garlic cloves, 1 stem of rosemary, and 1/2 bunch of parsley.
In a mixing bowl, place your cup of unsalted softened butter, 2 tsp lemon zest, 1 tbsp fresh rosemary, 1 tbsp thyme leaves, 2 tsp salt, and 1/2 tsp black pepper. Mix together
Using the back of a wooden spoon, carefully separate the skin from the meat while leaving the skin intact between the breasts.
Place your turkey in a large roasting pan with a roasting rack. (if you don't have one ***see recipe notes)
Rub 1/3 of the butter mixture inside the skin pockets created by separating the skin from the meat. Spread the rest of the butter with an even coating in the upper parts of the turkey. Sprinkle a bit more salt to taste.
Place the turkey in a preheated oven for about 2 hrs and 30 mins or until the thickest part of the thigh registers 165°F with a probe thermometer without touching bone.
Let turkey rest at room temperature for 30 minutes before carving.