01 - Whisk together Greek yogurt, garlic, lemon juice, olive oil, oregano, cumin, paprika, salt, pepper, and lemon zest in a large bowl until fully combined.
02 - Add 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 absorption.
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 - Grill: Place chicken on grill and cook for 6–8 minutes per side until internal temperature reaches 165°F. Oven: Place 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 chopped parsley and serve with lemon wedges.