01 - Whisk together olive oil, garlic, cumin, smoked paprika, oregano, coriander, salt, pepper, and lemon juice. Coat chicken breasts thoroughly in the marinade. Refrigerate for at least 15 minutes or overnight for deeper flavor.
02 - Heat a grill pan or skillet over medium-high heat. Cook marinated chicken breasts for 5-6 minutes per side until golden brown and internal temperature reaches 165°F. Let rest for 5 minutes, then slice into strips.
03 - Bring chicken broth or water to a boil. Stir in couscous, cover immediately, and remove from heat. Let stand covered for 5 minutes until liquid is absorbed. Fluff with a fork.
04 - In a small bowl, whisk together tahini, yogurt, lemon juice, olive oil, grated garlic, salt, and pepper. Gradually add warm water while whisking until reaching desired drizzling consistency.
05 - Divide fluffed couscous among four bowls. Layer with spinach or arugula, sliced chicken, cherry tomatoes, cucumber, red onion, Kalamata olives, and crumbled feta cheese.
06 - Drizzle lemon-tahini sauce generously over each bowl. Garnish with fresh chopped parsley. Serve immediately while chicken is warm.