1. Preheat your Air Fryer to 400 F (200 C).Combine ketchup, oil, white wine vinegar, Worcestershire sauce, brown sugar, garlic, and rosemary in a non-reactive bowl.
2. Add the chicken drumsticks and toss to coat. Season with salt and pepper to taste.
3. Place chicken drumsticks in the Air Fryer basket. Cook for 8-10 minutes on each side or until cooked through. Transfer into a serving dish.