Following these steps will help you create delicious Grilled BBQ Chicken Drumsticks:

1. Prep the Drumsticks: Start by patting the chicken drumsticks dry with paper towels. This helps achieve a crispy skin during grilling.
2. Make the Marinade: In a large bowl, combine olive oil, garlic powder, onion powder, paprika, salt, black pepper, and cayenne pepper (if using). Mix well.
3. Marinate the Chicken: Add the chicken drumsticks to the bowl and toss until they are well coated. Allow the drumsticks to marinate in the refrigerator for at least 30 minutes, or ideally, 2-4 hours for better flavor.
4. Preheat the Grill: Preheat your grill to medium-high heat (about 350°F to 400°F / 175°C to 200°C).
5. Oil the Grill Grates: Lightly oil the grill grates to prevent sticking. You can do this by using a paper towel dipped in oil and using tongs to wipe it across the grates.
6. Grill the Chicken: Place the marinated chicken drumsticks on the hot grill. Cook for about 30-40 minutes, turning them every 7-10 minutes for even cooking.
7. Add BBQ Sauce: During the last 10 minutes of cooking, brush the drumsticks with the barbecue sauce. This allows the glaze to caramelize and enhances the flavor.
8. Check for Doneness: The drumsticks are done when they reach an internal temperature of 165°F (75°C). Use a meat thermometer for accuracy.
9. Rest the Chicken: Once cooked, remove the chicken from the grill and cover it loosely with foil. Let it rest for 5-10 minutes to allow the juices to redistribute.
10. Serve and Enjoy!: Garnish with fresh parsley if desired and serve the drumsticks hot.