Pat the chicken breast dry and cut into 1-inch cubes.
In a medium bowl, whisk together the olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Toss the chicken cubes in the marinade until they are thoroughly and evenly coated.
Preheat the air fryer to 400°F and cook the chicken for 10-12 minutes until golden brown and cooked through.
While the chicken is air-frying, combine the Greek yogurt, red wine vinegar, and chopped fresh dill in a small bowl to create the creamy dressing.
Build the bowl by adding the cooked quinoa as the base, followed by the air-fried chicken, diced cucumber, halved cherry tomatoes, and minced red onion.
Top the bowl with sliced avocado and a generous dollop of the creamy dill-yogurt sauce before serving.