Preheat the air fryer to 400°F (200°C) to ensure a hot cooking environment for crispy skin.
Pat the chicken drumsticks dry thoroughly with paper towels. Season evenly with salt, pepper, and garlic powder (or fresh garlic).
Arrange drumsticks in the air fryer basket in a single layer without overcrowding to ensure proper air circulation.
Cook the drumsticks for about 20 minutes, flipping halfway through, until the skin is crispy and the internal temperature reaches 165°F (74°C).
While the chicken cooks, prepare the balsamic glaze by combining balsamic vinegar, honey, and fresh herbs in a small saucepan. Simmer gently until thickened and glossy.
Brush the balsamic glaze over the drumsticks during the last 3-5 minutes of air frying to caramelize the coating without burning.
Remove drumsticks and let them rest for 5 minutes to allow juices to redistribute and the glaze to set before serving.