Begin by marinating the chicken. In a large mixing bowl, combine the chicken thighs, 2 tablespoons of olive oil, garlic powder, paprika, salt, pepper, and oregano. Mix thoroughly, ensuring that the chicken is evenly coated. Let it marinate for about 10 minutes.
While the chicken is marinating, prepare the vegetables. In another bowl, toss the broccoli, bell peppers, and onion with the remaining 2 tablespoons of olive oil and a sprinkle of salt and pepper to taste.
Preheat the air fryer to 380°F (190°C).
Place the marinated chicken thighs in the air fryer basket in a single layer. Air fry for 12 minutes, flipping the chicken halfway through.
After 12 minutes, add the mixed vegetables to the air fryer basket. Return the basket to the air fryer and cook everything together for an additional 12-15 minutes, or until the chicken reaches an internal temperature of 165°F (75°C) and the vegetables are tender.
Once cooked, remove from the air fryer and allow to cool for a few minutes. Chop the chicken into bite-sized pieces if desired.
Portion the chicken and vegetables into meal prep containers. Store in the fridge for up to 4 days.