Preparation: Preheat your oven to 200°C/390°F (180°C for fan-forced ovens). Line a baking tray with foil and place a rack on top to ensure the drumsticks get crispy on all sides (Note 4).
Seasoning: In a shallow bowl, combine the garlic powder, onion powder, smoked paprika, black pepper, salt, flour, and baking powder. Mix well.
Coat in Oil: Drizzle the chicken drumsticks with the olive oil. Make sure to pull and stretch the skin to cover as much of the meat as possible.
Coat in Seasoning: Dip each drumstick into the seasoning mixture, shaking off any excess. Place the coated drumsticks on the prepared rack. Repeat this step with all the drumsticks.
Spray with Oil: Generously spray the drumsticks with oil to help them crisp up in the oven.
Bake: Bake the drumsticks for 30 minutes, rotating the tray halfway through cooking. Then, increase the oven temperature to 220°C/430°F (200°C for fan-forced) and bake for an additional 15 minutes or until the skin is golden and crispy. Serve hot and enjoy!