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Use a medium-sized plastic bowl for mixing together the garlic powder, paprika, nutmeg, cardamon, and cinnamon. Stir the spices for at least 30 seconds so you have fully mixed them together. Just place the chicken strips into the spice mixture and toss them until they have been covered with the spice mixture on both sides. Then, drizzle them with a bit of olive oil and toss them again to make sure that they are fully coated in the olive oil and spice mixture. Heat your grill and grease a large piece of aluminum foil. Set it on the grill with the greased side up once the grill is heated. Turn the chicken over a few times, until cooked through. This should take about 8 minutes on each side, depending on the size of the chicken strips. If your grill is smaller, you may have to grill the chicken in 2 batches. You'll need to do this before you can begin to assemble your shawarma. You can add lettuce, onion, tahini sauce, pickled cabbage, hummus, or whatever other ingredients you'd like to place in the flatbread. Place the chicken in the bread first, followed by the other toppings, pouring on the tahini sauce last. Wrap the flatbread similarly to a burrito, leaving an inch of space between the ingredients and the top of the bread so they don't pour out. Once you do that, your chicken shawarma will be ready to eat!
Mix the spices together in a bowl. Add the chicken strips to the mixture and toss them before drizzling them with the olive oil. Prepare your grill. Place the spiced chicken onto the foil. Remove the chicken from the grill and place on a serving platter. Wrap your chicken in the flatbread with the other ingredients.