Steps
1. In a bowl, combine olive oil, lemon juice, oregano, garlic powder, salt, and pepper.
2. Add the chicken breast to the marinade, ensuring it is well-coated. Let it marinate for at least 30 minutes.
3. Preheat the grill or a grill pan over medium-high heat.
4. Grill the chicken for about 6-7 minutes on each side, or until fully cooked and internal temperature reaches 165°F (75°C).
5. Remove from heat and let rest for a few minutes before slicing.
6. Garnish with fresh parsley and serve warm.