Slice the chicken into strips and marinate with all the listed spices. Let it rest in the refrigerator for 2 hours.

Sauté the onions in 1 tablespoon of oil.

Add the sliced chicken to the onions, then add the green bell peppers.

Cook until the chicken is fully cooked through.

Prepare the flatbread and fill it with the chicken shawarma mixture. Roll up the sandwiches.