01 - Whisk together Greek yogurt, minced garlic, lemon juice, olive oil, oregano, cumin, smoked paprika, salt, pepper, and lemon zest in a large bowl until thoroughly combined.
02 - Add chicken breasts to the bowl and turn to coat completely. Cover tightly and refrigerate for a minimum of 2 hours, maximum 8 hours for optimal flavor penetration.
03 - Preheat grill to medium-high heat or preheat oven to 425°F with rack positioned in the center.
04 - Remove chicken from marinade, allowing excess to drip off. Discard used marinade—do not reuse.
05 - Grill Method: Place chicken on preheated grill and cook 6–8 minutes per side until internal temperature reaches 165°F. Oven Method: Arrange chicken on parchment-lined baking sheet and bake 18–22 minutes until cooked through.
06 - Let chicken rest for 5 minutes before slicing. Garnish with fresh parsley and serve with lemon wedges on the side.