Prepare the Marinade: In a small mixing bowl, combine the ranch seasoning mix, olive oil, garlic powder, onion powder, smoked paprika, black pepper, and cayenne pepper (if using). Stir well until the mixture forms a smooth, paste-like consistency.
Coat the Chicken: Place the chicken drumsticks into a large resealable plastic bag or a mixing bowl. Pour the prepared marinade over the chicken. Seal the bag or cover the bowl and gently massage the marinade into the drumsticks, ensuring each piece is thoroughly coated. Refrigerate and allow to marinate for a minimum of 1 hour (up to 4 hours for maximum flavor).
Preheat the Grill: Heat your grill to a medium-high temperature (about 375°F to 400°F). If you’re using a charcoal grill, arrange the coals on one side to create zones for direct and indirect heat grilling.
Grill the Drumsticks: Remove the chicken drumsticks from the marinade, allowing any excess marinade to drip off. Place the drumsticks on the grill over direct heat. Grill the chicken, turning occasionally, for about 25-30 minutes, or until the internal temperature reaches 165°F. Look for the skin to be crispy and golden brown for optimal texture.
Rest and Serve: Once cooked, transfer the drumsticks from the grill to a cutting board or plate and let them rest for about 5 minutes. This resting period will help retain their juiciness.
Garnish and Enjoy: Arrange the grilled drumsticks on a serving platter. Sprinkle freshly chopped parsley over the top for a vibrant touch and serve with lemon wedges on the side, allowing guests to squeeze fresh lemon juice for an added zing of flavor!