Pat the chicken drumettes thoroughly dry with paper towels to remove surface moisture.
In a large mixing bowl, combine the drumettes with cornstarch, salt, black pepper, and onion powder; toss until the poultry is evenly coated.
Preheat the air fryer to 400°F (200°C).
Place the drumettes in the air fryer basket in a single layer, ensuring space between pieces for optimal airflow.
Air fry for 10 minutes, then use tongs to flip each drumette.
Continue cooking for an additional 8 to 10 minutes until the skin is golden brown and the internal temperature reaches 165°F (74°C).
While the chicken cooks, combine maple syrup, minced garlic, soy sauce, and olive oil in a small saucepan over medium-low heat.
Simmer the glaze for 4 minutes or until it reduces slightly to a syrupy consistency.
Transfer the cooked drumettes to a clean bowl and pour the warm maple garlic glaze over them, tossing to ensure complete emulsified coverage.
Optional: Return the glazed chicken to the air fryer for 1 minute at 400°F to further caramelize the sugars.