Start by cutting the boneless, skinless chicken thighs into small, bite-sized pieces.
In a mixing bowl, combine the chicken pieces with the cornstarch, salt, and black pepper. Toss until evenly coated.
Preheat your air fryer to 375°F (190°C) for about 5 minutes.
Place the coated chicken in the air fryer basket in a single layer. Cook for 12-15 minutes, shaking halfway through.
In a small saucepan over medium heat, combine the ketchup, soy sauce, brown sugar, ginger paste, crushed garlic, and red pepper flakes. Stir until the sugar is dissolved.
Once the chicken is cooked, place it in a large mixing bowl. Pour the sauce over the chicken and toss until well coated.
Serve over steamed rice or alongside a fresh vegetable stir-fry.
