Cut the chicken into bite-sized pieces and chop the veggies into similar-sized chunks.
In a mixing bowl, combine chicken pieces with olive oil, garlic powder, paprika, Italian seasoning, salt, and pepper. Toss until evenly coated.
In a separate bowl, toss the chopped bell peppers and broccoli with olive oil, garlic powder, paprika, and a pinch of salt and pepper.
Preheat the air fryer to 375°F (190°C) for 3-5 minutes.
Arrange the chicken and veggies in the air fryer basket in a single layer, avoiding overcrowding.
Air fry the chicken and veggies for 15 minutes, flipping halfway through. Ensure the chicken reaches an internal temperature of 165°F (74°C).
Transfer the cooked chicken and veggies to a serving dish and squeeze fresh lemon juice over the top before serving.
