Preheat oven to 375 degrees.
Combine spice ingredients and store in a container with a tight-fitting lid. Obviously, if you just want to make a small amount the first time, you could scale back the proportions.
Rinse and pat the chicken dry.
Sprinkle four teaspoons of the rub evenly over all sides of the chicken.
Spread the seasoned chicken evenly on a parchment-lined, rimmed baking sheet.
Brush the chicken with melted butter using a silicone brush.
Bake at 375 for 35-45 minutes, until the skin, is crispy and juices from the pierced flesh are clear (not pink).