01 - In a mixing bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, smoked paprika, kosher salt, and black pepper until well combined.
02 - Place the chicken breasts in a large resealable plastic bag or shallow dish. Pour the marinade over the chicken, turning each piece to ensure complete and even coating. Seal 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 to prevent the chicken from sticking.
04 - Remove the chicken from the marinade, allowing any excess to drip off. Place the breasts onto the hot grill and cook for 6 to 7 minutes per side, until the internal temperature registers 165°F on a meat thermometer and the juices run clear.
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 before serving.
06 - Arrange the sliced chicken on a platter and garnish with freshly chopped parsley and lemon wedges, if desired.