01 - In a large mixing bowl, whisk together Greek yogurt, minced garlic, lemon juice, olive oil, oregano, cumin, smoked paprika, salt, black pepper, and lemon zest until smooth and well combined.
02 - Add chicken breasts to the marinade, turning pieces to coat thoroughly on all sides. Cover bowl with plastic wrap and refrigerate for minimum 2 hours, maximum 8 hours for optimal flavor penetration.
03 - Preheat outdoor grill to medium-high heat (approximately 400°F) or preheat indoor oven to 425°F. Prepare baking sheet with parchment paper if using oven method.
04 - Take chicken out of marinade, allowing excess liquid to drip off. Discard used marinade—do not reuse for food safety reasons.
05 - For grilling: place chicken on preheated grill and cook for 6 to 8 minutes per side until internal temperature reaches 165°F. For baking: arrange chicken on prepared baking sheet and bake for 18 to 22 minutes until cooked through.
06 - Let cooked chicken rest for 5 minutes to allow juices to redistribute. Sprinkle with fresh parsley and serve with lemon wedges on the side.