Green-Garlic-Rubbed Buttery Roast Chicken

Season chicken all over inside and out with salt and pepper (make sure to get in and around every nook and cranny; about 4 tsp. Diamond Crystal or 2½ tsp. Morton kosher salt). Place on a wire rack set inside a rimmed baking sheet and let sit at room temperature while you make the garlic butter, or chill, uncovered, up to 1 day. If chilling, let sit at room temperature 1 hour before roasting.