Add the chicken to a Dutch oven or baking dish. Prick lemon with a knife in several places, and then insert lemon in the chicken's cavity. Sprinkle the chicken with salt, pepper, smoked paprika, and garlic powder. Place rosemary sprigs and garlic cloves around the chicken. Cut butter into smaller slices and place it around the chicken. Pour the chicken broth into the Dutch oven. Cover and place in the oven and roast for 45 minutes.