Make the brining solution by combining all ingredients in a large pot.
Rinse and place chicken in brine and refrigerate for 8–12 hours.
Remove chicken from the brine. Rinse and dry thoroughly with paper towels.
Let chicken rest at room temperature for two hours.
Preheat oven to 475°.
Rub the chicken inside and out with the unsalted butter and salt and pepper.
Fill the cavity with the garlic and remaining parsley.
Truss the bird and bake for 20–25 minutes.
Lower the heat to 400° and cook for an additional 30–45 minutes or until the internal temperature reaches 165°.