Prepare the Marinade: Combine olive oil, lemon juice, garlic powder, paprika, oregano in a bowl. Add salt and pepper for seasoning
Marinate the Chicken: Pour the marinade over the chicken breasts. Allow it to sit for 10–15 minutes at the minimum (better yet, let it refrigerate overnight for more deep taste).
Preheat the Grill: When hot, heat your grill pan or outdoor grill to medium-high.
Grill the Chicken: Place the Chicken on the grill and cook 6–8 minutes each side, or until cooked through (cooking time will depend on thickness of the breasts). It should reach 165°F (74°C) with a thermometer.
Rest Before Serving: Take the chicken out from the grill and allow to rest for 5 minutes before slicing in order to maintain its juices.