01 - In a large bowl, whisk together Greek yogurt, garlic, lemon juice, olive oil, oregano, cumin, paprika, salt, pepper, and lemon zest until smooth and well combined.
02 - Add the chicken breasts to the marinade, turning to coat thoroughly on all sides. Cover the bowl and refrigerate for at least 2 hours, up to 8 hours, to allow flavors to penetrate the meat.
03 - Preheat grill to medium-high heat or preheat oven to 425°F. Ensure your cooking method is ready before removing chicken from the refrigerator.
04 - Take the chicken breasts out of the marinade, letting excess drip off. Discard any leftover marinade—do not reuse it.
05 - Grill: Place chicken on preheated grill and cook for 6–8 minutes per side, turning once, until internal temperature reaches 165°F. Oven: Arrange chicken on a lined baking sheet and bake for 18–22 minutes or until cooked through.
06 - Let the chicken rest for 5 minutes before slicing to retain juices. Sprinkle with fresh parsley and serve with lemon wedges on the side.