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 and refrigerate for at least 2 hours, up to 8 hours, to allow flavors to penetrate.
03 - Preheat grill to medium-high heat or preheat oven to 425°F.
04 - Remove the chicken from marinade and let excess drip off. Discard any leftover marinade to prevent cross-contamination.
05 - For grilling: Place chicken on grill and cook for 6–8 minutes per side or until internal temperature reaches 165°F. For baking: Place 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. Garnish with fresh parsley and serve with lemon wedges.