Preheat the air fryer: Set it to 380°F (193°C) for 3–5 minutes. A hot basket helps crisp the skin.
Dry the drumsticks: Pat them well with paper towels. Dry skin equals crisp skin.
Make the spice rub: In a small bowl, mix salt, pepper, garlic powder, onion powder, smoked paprika, and chili powder or cayenne if using.
Season and oil: Toss drumsticks with olive oil, then sprinkle the spice rub all over. Coat every side.
Arrange in the basket: Place drumsticks in a single layer in the air fryer, leaving a little space between each. Work in batches if needed.
Air fry, round one: Cook at 380°F (193°C) for 10 minutes. Flip the drumsticks.
Air fry, round two: Cook another 8–10 minutes, until internal temperature reaches 165°F at the thickest part and the skin looks crisp.
Sauce and caramelize: Stir the BBQ sauce with apple cider vinegar if you like it a bit tangy. Brush a generous layer over the drumsticks. Air fry at 400°F (204°C) for 2–3 minutes to set and lightly caramelize the sauce.
Rest and serve: Let the chicken rest for 3–5 minutes. Brush with a little more warm BBQ sauce if you want extra sticky goodness.