01 - In a large bowl, whisk together Greek yogurt, minced garlic, lemon juice, olive oil, oregano, cumin, smoked paprika, salt, black pepper, and lemon zest until thoroughly combined.
02 - Add chicken breasts to the bowl, turning to coat completely with the marinade. Cover 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 the marinade, allowing excess to drip off. Discard any remaining marinade.
05 - Grill: Place chicken on preheated grill and cook for 6–8 minutes per side until internal temperature reaches 165°F. Oven: Arrange chicken on a lined baking sheet and bake for 18–22 minutes until cooked through.
06 - Let chicken rest for 5 minutes before slicing. Garnish with fresh parsley and serve with lemon wedges.