Mix together oregano, cinnamon, cumin, coriander, salt and allspice in a small bowl.
Combine chicken, vegetable oil and Shawarma spice mix and toss until chicken is coated. Let the chicken marinate at room temperature for 30mins, or cover and refrigerate overnight.
Preheat the air fyer to 350 F / 170 C.
Add chicken to the air fryer basket.
Cook for 12-15 mins, shaking the basket at least once.
To make the optional yogurt dressing, whisk together Greek yogurt and lemon juice in a small bowl or measuring cup.
Assemble individual bowls by layering cauliflower rice, salad greens, cucumber, tomatoes, olives and chicken shawarma. Top with the yogurt dressing, if desired.