Cut the boneless, skinless chicken breasts into bite-sized pieces and place them in a mixing bowl.
In a separate bowl, combine the breadcrumbs, grated Parmesan cheese, garlic powder, onion powder, paprika, salt, black pepper, and dried Italian herbs (if using). Mix well.
Beat the egg in a small bowl. Dip each chicken piece into the egg, allowing the excess to drip off. Then, coat it in the breadcrumb mixture, pressing gently to ensure it sticks. Repeat with all chicken pieces.
Preheat your air fryer to 400°F (200°C) for about 5 minutes.
Lightly spray the air fryer basket with cooking spray. Arrange the breaded chicken bites in a single layer. Avoid overcrowding the basket for even cooking.
Air fry the chicken bites for 10-12 minutes, shaking the basket halfway through, until they are golden brown and cooked through (internal temperature should reach 165°F/75°C).
Remove the chicken bites from the air fryer and let them cool slightly before serving. Enjoy with your favorite dipping sauce!