Steps
1. Preheat oven to 375°F (190°C).
2. In a pan, heat olive oil over medium heat and sauté sliced onions until soft and caramelized, about 10 minutes.
3. Add sumac, allspice, cinnamon, and salt to the onions; stir well and cook for another 2 minutes.
4. Rub the chicken thigh with a pinch of salt and a little sumac.
5. Place the flatbread on a baking tray, spread the caramelized onions evenly over it.
6. Place the chicken thigh on top of the onions.
7. Bake in the oven for 25-30 minutes, or until the chicken is fully cooked and skin is crispy.
8. Garnish with fresh parsley before serving.