Steps
1. In a small bowl, mix olive oil, lemon juice, oregano, garlic powder, salt, and pepper.
2. Place the chicken breast in a resealable plastic bag or a 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 marinade.
5. Grill the chicken for 6-7 minutes on each side, or until cooked through and juices run clear.
6. Let it rest for a few minutes before slicing.
7. Serve with lemon slices and garnish with fresh parsley.