Pat dry the half chicken with a kitchen towel and set it aside.
In a small bowl, combine the ingredients for the spice rub: paprika, cumin, garlic powder, onion powder, parsley, salt, and pepper.
Massage the chicken with oil, ensuring it is well coated, and then sprinkle the spice rub generously over the half chicken. Allow the chicken to marinate for at least 30 minutes.
Preheat a grill pan or outdoor grill over medium heat.
Add the marinated chicken to the grill pan or grill and cook for approximately 20 minutes, turning occasionally, until the chicken is cooked through and has beautiful grill marks.
Meanwhile, in another bowl, mix the melted butter, garlic powder, salt, and pepper to prepare the basting sauce.
After 20 minutes of grilling, brush the chicken with the basting sauce, ensuring it is coated evenly. Continue grilling for an additional 10-15 minutes or until the chicken is fully cooked and the flavors are enhanced with grill marks. The chicken must be 165F internally
Transfer the grilled chicken to a plate and garnish with chopped parsley for added freshness.
Serve the flavorful chicken with some grilled veggies on the side.