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