Make the Marinade: Mix olive oil, lemon juice, garlic, cumin, paprika, cinnamon, oregano, salt, and pepper in a bowl.
Marinate the Chicken: Coat the chicken breasts in the marinade and let it sit in the fridge for 30 minutes to 2 hours.
Cook the Chicken: Preheat the oven to 400°F (200°C) or heat a grill pan. Cook the chicken for 20-25 minutes in the oven or 5-7 minutes per side on the grill until fully cooked.
Serve: Let the chicken rest for a few minutes, then slice and serve with couscous, Greek yogurt, and fresh vegetables.