In a mixing bowl, whisk together olive oil, soy sauce, brown sugar, garlic, and black pepper.
Place pork chops in a resealable bag or shallow dish. Pour marinade over the pork chops, ensuring they are well coated. Marinate for at least 30 minutes or up to 8 hours in the refrigerator.
Preheat grill or skillet to medium-high heat. Remove pork chops from marinade and cook for 4-5 minutes on each side, or until internal temperature reaches 145°F (63°C).
Let the pork chops rest for 3 minutes before serving.