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 chicken breasts to the bowl, turning to coat thoroughly. Cover with plastic wrap and refrigerate for at least 2 hours or up to 8 hours for maximum flavor penetration.
03 - Preheat grill to medium-high heat or preheat oven to 425°F.
04 - Remove chicken from marinade, allowing excess to drip off. Discard any remaining marinade for food safety.
05 - For grilling: Place chicken on preheated grill and cook 6 to 8 minutes per side until internal temperature reaches 165°F. For baking: Place chicken on a lined baking sheet and bake 18 to 22 minutes until cooked through.
06 - Let chicken rest for 5 minutes before slicing to retain juices. Garnish with fresh parsley and serve with lemon wedges.