Preheat oven to 400°F (200°C)
In a large bowl, mix together ground chicken, onion, garlic, parsley, cumin, paprika, oregano, salt, and pepper to create the meatball mixture.
Using damp hands, shape the mixture into 1.5-inch meatballs.
In a large oven-proof skillet, heat olive oil over medium heat. Add meatballs and cook for 5 minutes until browned on all sides.
Place skillet in oven and bake for 15 to 20 minutes, or until meatballs are cooked through.
While meatballs bake, prepare couscous by combining with water or broth in a medium saucepan. Bring to a boil, then reduce heat, cover, and simmer for 5 minutes, or until liquid is absorbed.
Fluff couscous with a fork and set aside.
In a small bowl, mix yogurt, lemon zest, and lemon juice to create the drizzle. Stir in optional herbs.
To assemble, divide couscous among bowls. Layer meatballs and vegetables on top, then drizzle with yogurt sauce. Serve warm.