Creating Lebanese Chicken can be straightforward if you follow these simple steps:

1. Prepare Marinade: In a bowl, mix olive oil, cumin, coriander, paprika, cinnamon, allspice, sumac, lemon juice, garlic, salt, and pepper.
2. Marinate Chicken: Coat the chicken thighs in the marinade. Let it rest for at least 30 minutes or refrigerate overnight for enhanced flavor.
3. Preheat Oven: Preheat your oven to 400°F (200°C).
4. Prepare Vegetables: In a large baking dish, arrange the sliced onion and bell peppers.
5. Add Chicken: Place the marinated chicken thighs on top of the vegetables in the baking dish.
6. Add Chicken Broth: Pour the chicken broth around the chicken and vegetables to keep them moist during cooking.
7. Bake: Cover the dish with aluminum foil and bake for 25 minutes. Then remove the foil and bake for an additional 15-20 minutes, or until the chicken is golden brown and cooked through.
8. Check Doneness: Ensure the internal temperature of the chicken reaches 165°F (75°C).
9. Garnish: Remove from the oven and let it rest for a few minutes. Garnish with fresh parsley before serving.
10. Serve: Plate the chicken with the roasted vegetables and drizzle some of the pan juices over the top.

These steps will guide you in creating this incredible Lebanese Chicken effortlessly.