Creating delectable BBQ Chicken Drumsticks is easy when you follow these steps:

1. Prepare Marinade: In a bowl, mix olive oil, garlic powder, onion powder, smoked paprika, salt, black pepper, and cayenne pepper (if using).
2. Marinate Chicken: Add chicken drumsticks to the bowl and coat with the marinade. Ensure each piece is well covered.
3. Refrigerate: Cover and refrigerate the marinated chicken for at least 30 minutes or up to overnight for deeper flavor.
4. Preheat Grill: Preheat your grill to medium-high heat (about 375°F or 190°C).
5. Clean Grill Grates: Ensure the grill grates are cleaned and oiled for easy cooking.
6. Grill Drumsticks: Place the marinated drumsticks on the grill. Cook for about 25-30 minutes, turning occasionally for even cooking.
7. Baste with Sauce: In the last 5 minutes of grilling, brush a liberal amount of barbecue sauce on the drumsticks, ensuring they get a nice glaze.
8. Check Internal Temperature: Chicken is done when it reaches an internal temperature of 165°F (74°C).
9. Remove and Rest: Once cooked, remove the drumsticks from the grill and let them rest for about 5 minutes before serving.
10. Garnish: Sprinkle chopped fresh parsley over the drumsticks for a pop of color and added flavor.

Following these steps will yield wonderfully smoky, flavorful BBQ Chicken Drumsticks.