Marinate the Chicken: In a bowl, season the chicken strips with olive oil, yogurt, garlic powder, paprika, cumin, salt, and black pepper.
Rest the Marinade: Let the chicken marinate for at least 1 hour, or overnight for the best results.
Cook the Chicken: Heat a grill or pan and add the marinated chicken strips. Cook, stirring, until the chicken is cooked through and slightly browned.
Warm the Tortillas: Heat the tortilla bread in a pan or on the grill for a few seconds on each side until warm and flexible.
Assemble: Place a portion of the grilled chicken onto each tortilla.
Add Toppings: Add the shredded lettuce, chopped red onion, and pickles.
Serve: Serve the diet chicken shawarma hot, alongside a green salad and garlic sauce.