Preheat oven to 450°
Whisk together oil, lemon juice, garlic, mustard, and spices in a bowl to create marinade.
Place chicken in a separate bowl and coat with ⅔ of the marinade. Mix well to coat.
Place vegetables in a separate bowl and coat with ⅓ of the marinade. Mix well to coat.
While the chicken is marinating, spread the vegetables out on a baking sheet and bake for 20 minutes.
Remove the baking sheet from the oven and add the chicken, nestling them around the vegetables. Place back in the oven and cook for about 25 minutes (until the chicken is done).
Remove the baking sheet from the oven and add the olives and feta. Place back in the oven for 10 minutes.
Add a bed of rice, then the chickens and vegetables. Sprinkle with chopped parsley and serve.