Pre-heat oven to 450℉.
Remove the chicken from the packaging and pat it completely dry with paper towels.
Place your chicken in a cast-iron pan. Spread butter all over the chicken and then add your spices to a small bowl mix together and sprinkle over the butter. If using lemon and garlic cloves insert them inside the cavity of the chicken.
Roast for about 1 hour, or 20 minutes per pound, until cooked through. The internal temperature should reach 165°F in the thickest part of the thigh, or juices should run clear.
Remove from the oven and let the chicken rest for 15 minutes before carving and serving.