In a bowl, combine olive oil, lemon juice, oregano, garlic powder, salt, and pepper. Add chicken breasts and coat evenly. Marinate for at least 30 minutes (or up to 2 hours for more flavor).
Preheat the Grill:
Preheat your grill to medium-high heat (about 375°F to 400°F).
Grill the Chicken:
Remove the chicken from the marinade and place it on the grill. Cook for about 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C).
Rest and Serve:
Once cooked, remove the chicken from the grill and let it rest for 5 minutes before slicing. Garnish with fresh herbs if desired.
Enjoy:
Serve with your choice of sides, such as grilled vegetables or a fresh salad.