Steps
1. In a small bowl, whisk together olive oil, lemon juice, oregano, garlic powder, salt, and pepper.
2. Place the chicken breast in a resealable bag or shallow dish, and pour the marinade over it. Seal the bag or cover the dish, and refrigerate for at least 30 minutes.
3. Preheat the grill or a grill pan over medium-high heat.
4. Remove the chicken from the marinade and discard the excess marinade.
5. Grill the chicken for about 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C).
6. Let the chicken rest for a few minutes, then slice and serve, garnished with fresh parsley if desired.