01 - In a medium mixing bowl, whisk together the olive oil, lemon juice, minced garlic, smoked paprika, dried oregano, salt, black pepper, and crushed red pepper flakes until well combined.
02 - Place the chicken breasts in a resealable plastic bag or shallow dish. Pour the marinade over the chicken, turning each piece to coat evenly. Seal the bag or cover the dish and refrigerate for at least 1 hour, 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 brush the grates with oil to prevent sticking.
04 - Remove the chicken from the marinade, allowing any excess to drip off. Place the chicken on the hot grill and cook for 6 to 8 minutes per side, until a meat thermometer inserted into the thickest part of each breast registers 165°F.
05 - Transfer the grilled chicken to a clean plate and let it rest for 5 minutes to allow the juices to redistribute. Garnish with chopped fresh parsley and lemon wedges before serving.