Prepare the marinade: In a small bowl, mix olive oil, lemon juice, garlic, oregano, paprika, salt, and pepper.
Marinate the chicken: Place the chicken breasts in a dish or ziplock bag. Pour the marinade over them, making sure they’re well coated. Let marinate for at least 30 minutes (or up to 2 hours in the fridge).
Preheat the grill: Heat your grill (or grill pan) to medium-high heat.
Grill the chicken: Place the chicken breasts on the grill and cook for about 5–6 minutes per side, or until the internal temperature reaches 165°F (74°C).
Rest and serve: Remove from the grill and let rest for 5 minutes before slicing. Serve with a fresh salad, grilled vegetables, or rice.