01 - In a mixing bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, smoked paprika, salt, and black pepper until well combined.
02 - Place the chicken breasts in a large resealable plastic bag or a shallow dish. Pour the marinade over the chicken, turning each piece to ensure even coating. Seal the bag or cover the dish and refrigerate for at least 30 minutes, or up to 4 hours for optimal flavor penetration.
03 - Preheat an outdoor grill or grill pan to medium-high heat (approximately 400°F). Lightly oil the grates using a paper towel dipped in vegetable oil to prevent the chicken from sticking.
04 - Remove the chicken breasts from the marinade, allowing any excess to drip off. Discard the remaining marinade. Place the chicken onto the hot grill and cook for 6 to 7 minutes per side, or until the internal temperature registers 165°F when measured with a meat thermometer inserted into the thickest part.
05 - Transfer the grilled chicken to a cutting board and let it rest for 5 minutes to allow the juices to redistribute. Slice against the grain for maximum tenderness.
06 - Arrange the sliced chicken on a serving platter and garnish with freshly chopped parsley and lemon wedges. Serve immediately alongside grilled vegetables, a mixed greens salad, or steamed rice.