Blend the first five ingredients in a small bowl.
Rub the chicken all over with 2 - 3 tablespoons of softened butter, then sprinkle generously with the spice rub. (You will only need about half the rub for one 3-pound chicken.)
Roast the chicken in a 450°F degree oven for 45 - 55 minutes. Remove from the oven and let it rest for 15 minutes before carving.